adj · noun · 5 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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/ˈliː.θəl/
Southern-England:Recorded audio is listed in the source snapshot.
rhymes with -iːθəl
CMU ARPABET:L IY1 TH AH0 L
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
adj
Meaning 1
Of, pertaining to, or causing death; deadly; mortal; fatal.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
noun
Meaning 2
Any weapon that causes death.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: non-lethal
3
noun
Meaning 3
An allele that causes the death of the organism that carries it.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
5
adjective satellite
Meaning 5
of an instrument of certain death
Definition source: Princeton WordNet 3.0
Examples
deadly poisons
lethal weapon
a lethal injection
Meaning relationships
Synonyms: deadly
Antonyms: none provided
History
Etymology
Learned borrowing from Latin lētālis (“deadly, mortal, fatal”), improperly written lēthālis, from lētum (“death”), improperly written as lēthum, from a supposed connection with Ancient Greek λήθη (lḗthē, “oblivion, forgetfulness”).
Abbreviation of “lauric acid ethereal salt”, so called because it occurs in the ethereal salt of lauric acid.
Across languages
Translations
69 source translations are retained for this English entry.
Arabic:
مُمِيت
(mumīt)
— of, pertaining to, or causing death; deadly; mortal; fatal
Belarusian:
смяро́тны
(smjarótny)
— of, pertaining to, or causing death; deadly; mortal; fatal
Belarusian:
смертано́сны
(smjertanósny)
— of, pertaining to, or causing death; deadly; mortal; fatal
Belarusian:
лета́льны
(ljetálʹny)
— of, pertaining to, or causing death; deadly; mortal; fatal
Bulgarian:
смъртоно́сен
(smǎrtonósen)
— of, pertaining to, or causing death; deadly; mortal; fatal
Bulgarian:
смъ́ртен
(smǎ́rten)
— of, pertaining to, or causing death; deadly; mortal; fatal
Bulgarian:
лета́лен
(letálen)
— of, pertaining to, or causing death; deadly; mortal; fatal
Catalan:
letal
— of, pertaining to, or causing death; deadly; mortal; fatal
Catalan:
mortal
— of, pertaining to, or causing death; deadly; mortal; fatal
Chinese Mandarin:
致命的
(zhìmìng de)
— of, pertaining to, or causing death; deadly; mortal; fatal
Chinese Mandarin:
致死的
(zhìsǐdē)
— of, pertaining to, or causing death; deadly; mortal; fatal
Czech:
smrtící
— of, pertaining to, or causing death; deadly; mortal; fatal
Czech:
smrtonosný
— of, pertaining to, or causing death; deadly; mortal; fatal
Czech:
smrtelný
— of, pertaining to, or causing death; deadly; mortal; fatal
Dutch:
dodelijk
— of, pertaining to, or causing death; deadly; mortal; fatal
Dutch:
letaal
— of, pertaining to, or causing death; deadly; mortal; fatal
Esperanto:
mortiga
— of, pertaining to, or causing death; deadly; mortal; fatal
Finnish:
kuolettava
— of, pertaining to, or causing death; deadly; mortal; fatal
Finnish:
tappava
— of, pertaining to, or causing death; deadly; mortal; fatal
Finnish:
letaali
— of, pertaining to, or causing death; deadly; mortal; fatal
French:
létal
— of, pertaining to, or causing death; deadly; mortal; fatal
French:
léthal
— of, pertaining to, or causing death; deadly; mortal; fatal
French:
mortel
— of, pertaining to, or causing death; deadly; mortal; fatal
French:
fatal
— of, pertaining to, or causing death; deadly; mortal; fatal
Georgian:
მომაკვდინებელი
(momaḳvdinebeli)
— of, pertaining to, or causing death; deadly; mortal; fatal
Georgian:
სასიკვდილო
(sasiḳvdilo)
— of, pertaining to, or causing death; deadly; mortal; fatal
Georgian:
ლეტალური
(leṭaluri)
— of, pertaining to, or causing death; deadly; mortal; fatal
German:
tödlich
— of, pertaining to, or causing death; deadly; mortal; fatal
German:
letal
— of, pertaining to, or causing death; deadly; mortal; fatal
Greek:
φονικός
(fonikós)
— of, pertaining to, or causing death; deadly; mortal; fatal
Greek:
θανατηφόρος
(thanatifóros)
— of, pertaining to, or causing death; deadly; mortal; fatal
Ancient Greek:
θανάσιμος
(thanásimos)
— of, pertaining to, or causing death; deadly; mortal; fatal
Indonesian:
letal
— of, pertaining to, or causing death; deadly; mortal; fatal
Irish:
marfach
— of, pertaining to, or causing death; deadly; mortal; fatal
Italian:
letale
— of, pertaining to, or causing death; deadly; mortal; fatal
Japanese:
必殺の
(hissatsu no)
— of, pertaining to, or causing death; deadly; mortal; fatal
Japanese:
致命的な
(chimeiteki na)
— of, pertaining to, or causing death; deadly; mortal; fatal
Japanese:
致死の
(chishi no)
— of, pertaining to, or causing death; deadly; mortal; fatal
Korean:
치명적인
(chimyeongjeog-in)
— of, pertaining to, or causing death; deadly; mortal; fatal
Korean:
치사의
(chisaui)
— of, pertaining to, or causing death; deadly; mortal; fatal
Latin:
mortifer
— of, pertaining to, or causing death; deadly; mortal; fatal
Latin:
mortiferus
— of, pertaining to, or causing death; deadly; mortal; fatal
Latin:
lētālis
— of, pertaining to, or causing death; deadly; mortal; fatal
Latin:
lēthālis
— of, pertaining to, or causing death; deadly; mortal; fatal
Macedonian:
смртен
(smrten)
— of, pertaining to, or causing death; deadly; mortal; fatal
Polish:
letalny
— of, pertaining to, or causing death; deadly; mortal; fatal
Polish:
śmiertelny
— of, pertaining to, or causing death; deadly; mortal; fatal
Polish:
śmiercionośny
— of, pertaining to, or causing death; deadly; mortal; fatal
Portuguese:
fatal
— of, pertaining to, or causing death; deadly; mortal; fatal
Portuguese:
letal
— of, pertaining to, or causing death; deadly; mortal; fatal
Portuguese:
mortal
— of, pertaining to, or causing death; deadly; mortal; fatal
Russian:
смерте́льный
(smertélʹnyj)
— of, pertaining to, or causing death; deadly; mortal; fatal
Russian:
смертоно́сный
(smertonósnyj)
— of, pertaining to, or causing death; deadly; mortal; fatal
Russian:
лета́льный
(letálʹnyj)
— of, pertaining to, or causing death; deadly; mortal; fatal
Serbo-Croatian:
смр̏тан
— of, pertaining to, or causing death; deadly; mortal; fatal
Serbo-Croatian:
смрто̀носан
— of, pertaining to, or causing death; deadly; mortal; fatal
Serbo-Croatian:
smȑtan
— of, pertaining to, or causing death; deadly; mortal; fatal
Serbo-Croatian:
smrtònosan
— of, pertaining to, or causing death; deadly; mortal; fatal
Slovak:
smrteľný
— of, pertaining to, or causing death; deadly; mortal; fatal
Slovak:
smrtonosný
— of, pertaining to, or causing death; deadly; mortal; fatal
Slovak:
smrtiaci
— of, pertaining to, or causing death; deadly; mortal; fatal
Slovene:
smrtonosen
— of, pertaining to, or causing death; deadly; mortal; fatal
Slovene:
smrten
— of, pertaining to, or causing death; deadly; mortal; fatal
Spanish:
letal
— of, pertaining to, or causing death; deadly; mortal; fatal
Swedish:
dödlig
— of, pertaining to, or causing death; deadly; mortal; fatal
Swedish:
livsfarlig
— of, pertaining to, or causing death; deadly; mortal; fatal
Ukrainian:
смерте́льний
(smertélʹnyj)
— of, pertaining to, or causing death; deadly; mortal; fatal
Ukrainian:
смертоно́сний
(smertonósnyj)
— of, pertaining to, or causing death; deadly; mortal; fatal
Ukrainian:
лета́льний
(letálʹnyj)
— of, pertaining to, or causing death; deadly; mortal; fatal