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Definition of lethal

lethal

/ˈliː.θəl/
le · thal
Adverb:lethally
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lethal Lexical Profile

lethal Game Scores & Validity

• adjective

1

Sufficient to cause death; deadly or fatal.

Example

"Certain wild mushrooms contain a lethal toxin that can cause severe organ failure if ingested."

2

Extremely harmful, destructive, or devastating in effect.

Example

"High inflation paired with rising unemployment proved to be a lethal combination for the administration's reelection campaign."

Synonyms
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Antonyms
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• Rhymes for lethal

• Nearby Words

let-out
letaba
letdown
lethal
lethality
lethally
lethargic

Word Origin & Etymology

Borrowed from Latin lethalis ('deadly'), a later spelling of letalis (from letum, meaning 'death'), which was altered by association with the mythological Greek river Lethe, the river of forgetfulness in the underworld.

Cite this Entry

Wordmom. (2026). Definition of Lethal. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/lethal
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