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lethal

le·thal

lethal

 
 
pronunciation:
li thl
part of speech: adjective
definition: intended to cause or capable of causing death or extreme harm; deadly.
Taken in large doses, this drug could be lethal.The huge man dealt him a lethal blow.
synonyms:
deadly, deathly, fatal, killing, mortal, poisonous
antonyms:
harmless
similar words:
baneful, harmful, malignant, murderous, noxious, pernicious, pestilent, terminal, toxic, virulent, vital
derivations: lethally (adv.), lethality (n.)