funny; amusing; strange; odd; improper; unsuitable
humorous; funny; amusing; laughable; hilarious; comical
ridiculous; absurd; silly; laughable
insane; crazy; nuts; out of one's mind
insane; crazy; nuts; out of one's mind
age at which even the slightest things seem funny (esp. said of a girl in the late teens); (lit.) age where even chopsticks rolling is amusing
to be amused (by, at); to wonder at