lethal Get Printable Handwriting (le-thal) 2 syllables Rhymes Learn It! Spelling Test Definition adjective. likely to cause or capable of causing death Example Sentence The snake's venom was not lethal. Synonyms deadly; fatal; killer Antonyms wholesome; healthy Rhymes Two Syllable Rhymes (1) lethal Three Syllable Rhymes (1) nonlethal Share with your friends: