Main entry: idiotic, imbecile, imbecilic
Definition: having a mental age of three to seven years
Main entry: idiotic, crackbrained
Definition: insanely irresponsible
Usage: an idiotic idea
Main entry: absurd, derisory, cockeyed, idiotic, ludicrous, laughable, preposterous, ridiculous, nonsensical
Definition: incongruous;inviting ridicule
Usage: 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 children was ridiculous