(of a person, remark) very stupid

senseless

not clear or bright; slow to understand; not exciting or interesting

unintelligent

foolish (and showing self-importance)

stupid

without reason, sense or good judgement; silly

nonsensical, idiotic

(of a person) knowing little or nothing; resulting from lack of knowledge

unaware, unknowing

a foolish person; ( not now used) a person with very low intelligence

stupid, foolish

giving no thought or care to something; not having or not requiring intelligence; not having a purpose

oblivious, stupid; automatic

unimportant; insignificant; mad; a child's pot used as a toilet

insane

(of a person) slow or behind in (emotional, intellectual, physical ) development

limited

foolish

silly, meaningless

unintelligent; foolish

not intelligent; irresponsible