terribly, extremely
J'étais terriblement inquiète.
I was terribly worried.
Je sais, ça paraît terriblement ardu, mais croyez-moi, on va y arriver.
I know it seems terribly difficult, but believe me, we’ll get there.
— Le Scaphandre et le Papillon (2007)
Je suis terriblement amoureux de toi quand j'y réfléchis.
When I think about it, I’m terribly in love with you.
— Les Fraises sauvages (1957)
C'est une personne terriblement fainéante.
They're an incredibly lazy person.
I'm terribly ashamed of it.
Ma hanche me fait terriblement mal.
My hip hurts terribly.
You smell terrible.