adv · 3 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
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/mɪˈsteɪ.kən.li/
Midwestern-US:Recorded audio is listed in the source snapshot.
CMU ARPABET:M IH0 S T EY1 K AH0 N L IY0
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
adv
Meaning 1
Wrongly; erroneously.
Definition source: English Wiktionary via Wiktextract
Usage: not-comparable
Examples
I mistakenly assumed that the shop was still there.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
adv
Meaning 2
By accident; by mistake; in error (without intention to do so).
Definition source: English Wiktionary via Wiktextract
Usage: not-comparable
Examples
Today I mistakenly took your packed lunch to work.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
adverb
Meaning 3
in a mistaken manner
Definition source: Princeton WordNet 3.0
Examples
he mistakenly believed it
Meaning relationships
Synonyms: erroneously
Antonyms: none provided
History
Etymology
Etymology tree English mistaken Middle English -ly English -ly English mistakenly From mistaken + -ly.
Across languages
Translations
43 source translations are retained for this English entry.
Azerbaijani:
yanlış
— wrongly
Azerbaijani:
səhvən
— wrongly
Esperanto:
erare
— wrongly
Finnish:
virheellisesti
— wrongly
French:
à tort
— wrongly
German:
irrtümlich
— wrongly
Greek:
εσφαλμένα
(esfalména)
— wrongly
Greek:
λανθασμένα
(lanthasména)
— wrongly
Hungarian:
tévesen
— wrongly
Polish:
błędnie
— wrongly
Tamil:
தவறாக
(tavaṟāka)
— wrongly
Tamil:
தப்பாக
(tappāka)
— wrongly
Arabic:
خَطَأً
(ḵaṭaʔan)
— by accident
Azerbaijani:
səhvən
— by accident
Chichewa:
mwatsoka
— by accident
Chinese Mandarin:
錯誤地 /错误地
(cuòwù de)
— by accident