extraterrestre

/ɛkstʁatɛʁɛstʁ/
1.
nounmasculine

extraterrestrial being; alien

Tu crois vraiment qu'il y a des extraterrestres sur Mars ?

Do you really believe there are extraterrestrials on Mars?

2.
adjective

originating from outside the Earth

figurative: extraordinary, out of this world

Ce joueur de foot a un niveau extraterrestre.

This football player has an out-of-this-world level.