deep, profound, deeply
Est-ce que ce lac est profond ?
Is this lake deep?
Le ruisseau devient moins profond à mesure que l'on remonte la rivière.
The stream gets shallower as you go upstream.
It's not deep enough.
Cet enfant a sombré dans un profond sommeil.
This child fell into a deep sleep.
André, c'est bien, mais tu es allé trop profond.
André, that's good, but you went too deep.
— Caché (2005)
Tu aurais pu creuser plus profond, non ?
You could have dug deeper, couldn't you?
— L’Enfance d’Ivan (1962)