GRE TOEFL IELTS lethal Definition Sufficient to cause death; deadly. Example "The snake's bite delivers a lethal dose of venom." Sign in to save GRE Quiz → TOEFL Quiz → IELTS Quiz → ← lesion lethargic → Study tips featuring "lethal" Audit Your Own Writing to Find Gaps Write GRE Words Into Your Own Sentences TOEFL Academic Vocabulary: Study by Topic Related words GRE swill GRE taper GRE testy GRE abacus SAT abase GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate SAT abdomen GRE abduct