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lethal

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lethal
lethal /ˈliːθəl/ adjective
 Date: 1500-1600
 Language: Latin
 Origin: lethalis, from lethum 'death', from letum (influenced by Greek lethe; lethargic)
1. causing death, or able to cause death ⇨ fatal:
    a lethal dose of heroin
    a lethal weapon
    death by lethal injection
    a lethal cocktail of drink and pills
    lethal to
    These chemicals are lethal to fish.
2. informal likely to be powerful or dangerous – often used humorously:
    They were all drinking lethal amounts of tequila!
    Higher taxes and higher inflation were a lethal combination.