1. crackbrained, idiotic

insanely irresponsible

Example Sentences:
'an idiotic idea'

Synonyms

• crackbrained

2. absurd, cockeyed, derisory, idiotic, laughable, ludicrous, nonsensical, preposterous, ridiculous

incongruous;inviting ridicule

Example Sentences:
'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'

Synonyms

• absurd
• cockeyed
• derisory
• laughable
• ludicrous
• nonsensical
• preposterous
• ridiculous

3. idiotic, imbecile, imbecilic

having a mental age of three to seven years

Synonyms

• imbecile
• imbecilic