thoughtful, pensive, lost in thought
Il prit un air profondément pensif.
He took on a deeply thoughtful expression.
Il examina l’invitation d’un air pensif.
He examined the invitation with a thoughtful look.
Cela le laissa pensif.
This left him thoughtful.
Elle a passé sa main dans ses cheveux avec un air pensif.
She ran her hand through her hair with a thoughtful expression.