Also means
deadly boring (colloquial)
Usage Note
Mortellement primarily means in a manner causing death, as in blessé mortellement ('mortally wounded'). In informal speech it is also used hyperbolically to mean 'deadly dull', as in c'est mortellement ennuyeux. The adjective mortel (feminine: mortelle) shares the same root.
Examples
"Il a été mortellement blessé dans l'accident."
Natural Translation
He was mortally wounded in the accident.

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