silly
The French word 'bête' can be used to describe someone or something as being silly or foolish. It is an adjective that can be used in a variety of contexts, from describing a person's behavior to a situation or idea. It is important to note that 'bête' can also be used to describe an animal, as it is the French word for 'beast'. However, in the context of describing someone as being silly, it is used as an adjective.
Don't act like an animal, don't act stupid!
This phrase is said when someone behaves in an inappropriate or foolish manner. Comparing the person to an animal, the speaker is expressing disapproval of their uncivilized, silly or thoughtless actions.
He's as dumb as his feet.
This is a humorous French expression used to describe someone who is not very smart. The comparison with feet accentuates the lack of intelligence, as feet are not generally associated with brain function.
She's playing the fool to get some rice.
This saying is usually used to describe someone who is pretending to be naive or ignorant in order to gain something. In this example 'rice' is a metaphor which could represent something of value or interest to the person acting naive.