terribly, extremely
Je suis terriblement occupé, tu comprends.
I'm terribly busy, you understand.
Le bus était terriblement bondé.
The bus was terribly crowded.
I’m terribly shy.
You smell terrible.
I was terribly worried.
J'étais terriblement inquiète.
I was terribly worried.
Tu as l'air terriblement fatigué.
You look terribly tired.