(a.) Destitute of wit or understanding; foolish; indiscreet\; not under the guidance of judgment.

a stranger to abnormal apish asinine asleep batty bedlamite befooled beguiled bereft of reason besotted blind to brainless brainsick buffoonish caught napping cockeyed crackbrained cracked crazed crazy credulous daffy daft dazed dead to deaf to deluded demented deprived of reason deranged disoriented distraught dizzy doting dumb empty-headed fatuitous fatuous featherbrained featherheaded flaky flighty fluttery fond fool foolheaded foolish frivolous fuddled futile gaga giddy giddy-brained giddy-headed giddy-pated giddy-witted goofy gulled hallucinated harebrain harebrained headless idiotic ignorant ill-advised ill-considered ill-contrived ill-devised ill-gauged ill-judged imbecile impercipient impolitic imprudent in ignorance of inadvisable inane incognizant inconsiderate indiscreet inept inexpedient infatuated injudicious insane insensate insensible insensible to irrational kooky lackbrained lean-minded lean-witted loco loony lunatic mad maddened manic maudlin mazed mental mentally deficient meshuggah mindless misadvised misguided moon-struck moronic myopic napping nitwitted non compos non compos mentis nonconceiving not all there not bright not right not with it nutty odd of little brain of unsound mind off out of it pea-brained pin-brained psycho queer rattlebrained rattleheaded rattlepated reasonless reckless sappy scatterbrained scramblebrained screwy senseless sentimental shatterbrained shortsighted sick silly slackminded slackwitted stark-mad stark-staring mad strange stupid tetched thoughtless touched unadvised unaware unaware of unbalanced unconscious unconscious of unconsidered undiscerning unforeseeing ungifted unhearing unhinged uninsightful unintellectual unintelligent unknowing unmindful unmindful of unperceiving unprehensive unrealizing unreasonable unreasoning unreflecting unreflective unsane unseeing unsensible unsettled unsound unsuspecting untalented unthinking unthoughtful unwise unwitting unwitty wacky wandering weak-minded wet