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Definition of lethal adjective from the Oxford Advanced American Dictionary

     

    lethal

     adjective
    adjective
    NAmE//ˈliθl//
     
     
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  1. 1causing or able to cause death synonym deadly synonym fatal a lethal dose of poison a lethal weapon (figurative) The closure of the factory dealt a lethal blow to the town. The snake's venom is rarely lethal to humans.
  2. 2(informal) causing or able to cause a lot of harm or damage You and that car—it's a lethal combination!
NAmE//ˈliθəli//
 
adverb
See the Oxford Advanced Learner's Dictionary entry: lethal