well-founded Antonyms

lift doesn't go all the way to the top unfounded stupid silly ridiculous rabid nonsensical mad lunatic loony unreasonable unsound weak devoid of substance unsubstantiated not right in the head dippy dim-witted cray cray coocoo coo-coo away with the fairies irrational insane inconsequential crayfish careless brash brainsick brainless blunt baseless asinine absurd cray crazed crazy illogical idiotic groundless foolish dim deranged demented daft cuckoo abnormal