stupid
silly
dumb
Arrête de poser des questions bêtes.
Stop asking stupid questions.
animals
beasts
small creatures/bugs
Il y a plein de petites bêtes dans le jardin.
There are plenty of little creatures/bugs in the garden.
(informal) exceptionally skilled person(s) or performers — 'beasts' (in a positive sense)
Ce sont de vraies bêtes au foot.
They're real beasts at football (they're amazing at football).