without reason, sense or good judgement; silly

nonsensical, idiotic

silly

stupid

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

oblivious, stupid; automatic

not trying to be gentle or polite; (of a person) stupid

slow to understand

foolish

silly, meaningless

not sensible; foolish

absurd, giddy, foolish

unintelligent; foolish

not intelligent; irresponsible