The absurd excuse that the dog ate his homework.
That's a cockeyed idea.
Ask a nonsensical question and get a nonsensical answer.
A contribution so small as to be laughable.
It is ludicrous to call a cottage a mansion.
A preposterous attempt to turn back the pages of history.
Her conceited assumption of universal interest in her rather dull chil.

An amusing film with a steady stream of pranks and pratfalls.
An amusing fellow.
A comic hat.
A comical look of surprise.
Funny stories that made everybody laugh.
A very funny writer.
It would have been laughable if it hadn't hurt so much.
A mirthful experience.
Risible courtroom antics.