Translation of "Désinvolte" in English

Tout le monde ne peut pas avoir une attitude si désinvolte.

not everybody can take so cavalier an attitude.

Il peut paraître désinvolte mais il sait de quoi il parle.

- He may come across as glib, but he knows what he's talking about.
- He may seem glib, but he knows what he's talking about.

Allez-vous me donner une réponse désinvolte ou allez-vous réfléchir avant de répondre ?

Are you going to give me a glib answer, or are you going to think before you reply?

Sa personne et son apparence même étaient de nature à attirer l'attention de l'observateur le plus désinvolte.

His very person and appearance were such as to strike the attention of the most casual observer.