imprudent

C'était imprudent de votre part de laisser la clé dans votre voiture.

It was careless of you to leave the key in your car.

C'était très imprudent et vraiment irréfléchi de ta part de lui parler comme tu l'as fait la nuit dernière.

It was very imprudent, very rash of you to speak about her the way you did last night.

Comme c'est imprudent !

How foolish!

Il est jeune et imprudent.

He is young and foolish.

Je sais que Tom est imprudent.

I know that Tom is careless.

C'était très imprudent de sa part.

That was very careless of him.

Tu es imprudent.

You're foolish.

Essayer de le ramener serait imprudent.

To try to bring it back would be foolish.