(of ignorance, stupidity etc) very great

coarse, insensitive

silly; foolish

stupid; crazy

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

not sensible; foolish

absurd, giddy, foolish

unintelligent; foolish

not intelligent; irresponsible