adj · verb · 11 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
Received-Pronunciation:/ɪmˈpɹɒp.ə/
Southern-England:Recorded audio is listed in the source snapshot.
Australian:/ɪmˈpɹɔp.ə/
General-American:/ɪmˈpɹɑ.pɚ/
General-American:Recorded audio is listed in the source snapshot.
rhymes with -ɒpə(ɹ)
CMU ARPABET:IH2 M P R AA1 P ER0
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
adj
Meaning 1
Unsuitable to needs or circumstances; inappropriate; inapt.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
adj
Meaning 2
Not in keeping with conventional mores or good manners; indecent or immodest.
Definition source: English Wiktionary via Wiktextract
Examples
improper conduct
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
adj
Meaning 3
Not according to facts; inaccurate or erroneous.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
4
adj
Meaning 4
Not consistent with established facts; incorrect.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
5
adj
Meaning 5
Not properly named; See, for example, improper fraction.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
6
adj
Meaning 6
Not specific or appropriate to individuals; general; common.
Definition source: English Wiktionary via Wiktextract
Usage: obsolete
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
7
adj
Meaning 7
Of a complex random variable, correlated with its conjugate.
Definition source: English Wiktionary via Wiktextract
Topics: mathematics, sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
8
verb
Meaning 8
To appropriate; to assign (something, to someone) as a possession or prerogative.
Definition source: English Wiktionary via Wiktextract
Usage: obsolete, transitive
Examples
For quotations using this term, see Citations:improper.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
9
adjective
Meaning 9
not suitable or right or appropriate
Definition source: Princeton WordNet 3.0
Examples
slightly improper to dine alone with a married man
improper medication
improper attire for the golf course
Meaning relationships
Synonyms: none provided
Antonyms: proper
10
adjective satellite
Meaning 10
not appropriate for a purpose or occasion
Definition source: Princeton WordNet 3.0
Examples
said all the wrong things
Meaning relationships
Synonyms: wrong
Antonyms: none provided
11
adjective satellite
Meaning 11
not conforming to legality, moral law, or social convention
Definition source: Princeton WordNet 3.0
Examples
an unconventional marriage
improper banking practices
Meaning relationships
Synonyms: unconventional, unlawful
Antonyms: none provided
History
Etymology
From Middle French impropre, from Latin improprius (“not proper”), from in- + proprius (“proper”). By surface analysis, im- + proper.
From Middle English empropren, perhaps from an unattested Anglo-Norman variant enproprier of Anglo-Norman apropr(i)er, approprier, related to modern French approprier.
Across languages
Translations
95 source translations are retained for this English entry.
Basque:
ezegoki
— unsuitable to needs or circumstances
Bulgarian:
неподходящ
(nepodhodjašt)
— unsuitable to needs or circumstances
Bulgarian:
неуместен
(neumesten)
— unsuitable to needs or circumstances
Catalan:
impropi
— unsuitable to needs or circumstances
Dutch:
ongepast
— unsuitable to needs or circumstances
Finnish:
sopimaton
— unsuitable to needs or circumstances
French:
impropre
— unsuitable to needs or circumstances
French:
inapproprié
— unsuitable to needs or circumstances
French:
inadapté
— unsuitable to needs or circumstances
German:
unpassend
— unsuitable to needs or circumstances
Greek:
ακατάλληλος
(akatállilos)
— unsuitable to needs or circumstances
Hindi:
अनुचित
(anucit)
— unsuitable to needs or circumstances
Japanese:
そぐわない
(soguwanai)
— unsuitable to needs or circumstances
Japanese:
不適切な
(futekisetsu na)
— unsuitable to needs or circumstances
Latin:
improprius
— unsuitable to needs or circumstances
Norwegian:
upassende
— unsuitable to needs or circumstances
Norwegian:
uegnet
— unsuitable to needs or circumstances
Portuguese:
impróprio
— unsuitable to needs or circumstances
Romanian:
impropriu
— unsuitable to needs or circumstances
Russian:
неуме́стный
(neuméstnyj)
— unsuitable to needs or circumstances
Russian:
неподходя́щий
(nepodxodjáščij)
— unsuitable to needs or circumstances
Russian:
ненадлежа́щий
(nenadležáščij)
— unsuitable to needs or circumstances
Slovak:
nevhodný
— unsuitable to needs or circumstances
Slovene:
neprimeren
— unsuitable to needs or circumstances
Tagalog:
di-angkop
— unsuitable to needs or circumstances
Turkish:
uygunsuz
— unsuitable to needs or circumstances
Ukrainian:
ненале́жний
(nenaléžnyj)
— unsuitable to needs or circumstances
Ukrainian:
невідпові́дний
(nevidpovídnyj)
— unsuitable to needs or circumstances
Armenian:
անպիտան
(anpitan)
— not in keeping with conventional mores or good manners
Armenian:
անվայել
(anvayel)
— not in keeping with conventional mores or good manners
Bulgarian:
неприличен
(nepriličen)
— not in keeping with conventional mores or good manners
Bulgarian:
непристоен
(nepristoen)
— not in keeping with conventional mores or good manners
Catalan:
impropi
— not in keeping with conventional mores or good manners
Danish:
upassende
— not in keeping with conventional mores or good manners
Danish:
uanstændig
— not in keeping with conventional mores or good manners
Dutch:
ongeschikt
— not in keeping with conventional mores or good manners
Dutch:
misplaatst
— not in keeping with conventional mores or good manners
Finnish:
säädytön
— not in keeping with conventional mores or good manners
Finnish:
sopimaton
— not in keeping with conventional mores or good manners
French:
impropre
— not in keeping with conventional mores or good manners
French:
inconvenant
— not in keeping with conventional mores or good manners
French:
grossier
— not in keeping with conventional mores or good manners
German:
unhöflich
— not in keeping with conventional mores or good manners
Greek:
ανάρμοστος
(anármostos)
— not in keeping with conventional mores or good manners
Hindi:
अशोभनीय
(aśobhnīya)
— not in keeping with conventional mores or good manners
Hindi:
अमर्यादित
(amaryādit)
— not in keeping with conventional mores or good manners
Irish:
aindílis
— not in keeping with conventional mores or good manners
Latin:
indecens
— not in keeping with conventional mores or good manners
Norwegian:
upassende
— not in keeping with conventional mores or good manners
Norwegian:
uanstendig
— not in keeping with conventional mores or good manners
Portuguese:
impróprio
— not in keeping with conventional mores or good manners
Portuguese:
indecente
— not in keeping with conventional mores or good manners
Portuguese:
indecoroso
— not in keeping with conventional mores or good manners
Russian:
непристо́йный
(nepristójnyj)
— not in keeping with conventional mores or good manners
Russian:
неприли́чный
(neprilíčnyj)
— not in keeping with conventional mores or good manners
Russian:
некорре́ктный
(nekorréktnyj)
— not in keeping with conventional mores or good manners
Sanskrit:
अकार्य
(akārya)
— not in keeping with conventional mores or good manners
Slovak:
nevhodný
— not in keeping with conventional mores or good manners
Spanish:
improprio
— not in keeping with conventional mores or good manners
Spanish:
impropio
— not in keeping with conventional mores or good manners
Spanish:
indebido
— not in keeping with conventional mores or good manners
Tagalog:
di-angkap
— not in keeping with conventional mores or good manners
Turkish:
uygunsuz
— not in keeping with conventional mores or good manners
Turkish:
yakışıksız
— not in keeping with conventional mores or good manners
Ukrainian:
непристо́йний
(neprystójnyj)
— not in keeping with conventional mores or good manners
Ukrainian:
некоре́ктний
(nekoréktnyj)
— not in keeping with conventional mores or good manners
Bulgarian:
неточен
(netočen)
— Not according to facts
Bulgarian:
неправилен
(nepravilen)
— Not according to facts
Dutch:
onjuist
— Not according to facts
Dutch:
foutief
— Not according to facts
Finnish:
väärä
— Not according to facts
Norwegian:
uriktig
— Not according to facts
Norwegian:
feilaktig
— Not according to facts
Norwegian:
urettmessig
— Not according to facts
Portuguese:
impróprio
— Not according to facts
Portuguese:
incorreto
— Not according to facts
Russian:
непра́вильный
(neprávilʹnyj)
— Not according to facts
Russian:
оши́бочный
(ošíbočnyj)
— Not according to facts
Russian:
ло́жный
(lóžnyj)
— Not according to facts
Slovak:
nesprávny
— Not according to facts
Turkish:
yanlış
— Not according to facts
Dutch:
inconsistent
— Not consistent with established facts
Dutch:
foutief
— Not consistent with established facts
Norwegian:
uriktig
— Not consistent with established facts
Portuguese:
impróprio
— Not consistent with established facts
Portuguese:
incorreto
— Not consistent with established facts
Russian:
непра́вильный
(neprávilʹnyj)
— Not consistent with established facts
Slovak:
nesprávny
— Not consistent with established facts
Catalan:
impropi
— Not properly named
Dutch:
verkeerd omschreven
— Not properly named
French:
impropre
— Not properly named
Japanese:
そぐわない
(soguwanai)
— Not properly named
Japanese:
不適切な
(futekisetsu na)
— Not properly named