mortel
deadly, fatal
adjective noun mor-TEL Less Common
Origin: Latin mortalis (subject to death)
Also means
mortal (noun: a mortal being)
Usage Note
Mortel as an adjective means deadly (une blessure mortelle = a fatal wound) or, in informal register, deadly boring (c'est mortel = it's a total drag). As a noun, un mortel / une mortelle means a mortal human being, often used poetically. The adverb is mortellement.
Examples
"Ce poison est mortel pour les animaux."
Natural Translation
This poison is deadly to animals.

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