atrocement

terribly, extremely

atroce awful, terrible + ment Forms adverbs meaning “-ly” and nouns denoting an action or result.
adverb Rare #49,762
terribly, extremely
FR: Elle est atrocement fatiguée.
EN: She’s terribly tired.

Vous devenez atrocement vulgaire !

You are becoming horribly vulgar!

— Les Visiteurs (1993)

Elle était atrocement maigre.

She was terribly thin.

Elle était atrocement mince.

She was horribly thin.

Il était atrocement mince.

He was horribly thin.