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lethal

Pronunciation: /ˈliːθ(ə)l/

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Definition of lethal

adjective

sufficient to cause death:a lethal cocktail of drink and pills
very harmful or destructive:the Krakatoa eruption was the most lethal on record
(in a sporting context) very accurate or skilful:a lethal drop-shot

Derivatives

lethality
lethally

Origin:

late 16th century (in the sense 'causing spiritual death'): from Latin lethalis, from lethum, a variant (influenced by Greek lēthē 'forgetfulness'), of letum 'death'