off the top of one's head in French
off the top of one's head in French
comme ça
(idiomatic) In an extemporaneous manner; without careful thought, preparation, or investigation.
de tête
(idiomatic) In an extemporaneous manner; without careful thought, preparation, or investigation.
à froid
(idiomatic) In an extemporaneous manner; without careful thought, preparation, or investigation.