If something is asinine, it is very, very silly or stupid.
The word asinine is not nice. It makes people think of someone not being very smart.
Examples:
The asinine idea made everyone laugh.
He said something asinine and everyone looked at him.
The asinine decision was not very good.
The asinine monkey wore a hat.
It was an asinine plan to build a house out of candy.
The asinine dog tried to drive a car.