Definition of lethal adjective from the Oxford Advanced Learner's Dictionary

     

    lethal

     adjective
    adjective
    BrE BrE//ˈliːθl//
     
    ; NAmE NAmE//ˈliːθl//
     
     
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  1. 1causing or able to cause death synonym deadly, 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!
  3. Word Origin late 16th cent. (in the sense ‘causing spiritual death’): from Latin lethalis, from lethum, a variant (influenced by Greek lēthē ‘forgetfulness’), of letum ‘death’.Extra examples All these knives are absolutely lethal. It was a potentially lethal mixture of drugs. The pesticide is lethal to all insect life. Any sharp pointed instrument is potentially a lethal weapon. He has been sentenced to death by lethal injection. She had been given a lethal dose of poison. The group claims that a lethal cocktail of pollutants is being poured into Scotland’s rivers and estuaries. The snake’s venom is rarely lethal to humans.
See the Oxford Advanced American Dictionary entry: lethal