(a.) Destitute of, deficient in, or contrary to, sense; without sensibility or feeling; unconscious; stupid; foolish; unwise; unreasonable.

abiotic abnormal absonant absurd aimless amorphous anesthetized apish asinine asleep azoic batty befooled beguiled benumbed bereft of reason besotted brainless brainsick buffoonish capricious casual cataleptic catatonic cockeyed cold comatose contradictory contrary to reason crackbrained cracked crazed crazy credulous daffy daft dazed dead deadened deluded demented deprived of reason deranged designless desultory dippy disarticulated discontinuous disjunct disordered disoriented dispersed disproportionate distraught dizzy doped doting drugged dumb empty empty-headed erratic exanimate fallacious fatuitous fatuous faulty fitful flaky flawed flighty fond fool foolheaded foolish formless frivolous fuddled futile gaga garbled goofy gratuitous gulled half-conscious hallucinated haphazard headless hit-or-miss idiotic ignorant ill-advised ill-considered ill-contrived ill-devised ill-gauged ill-judged illogical imbecile imbecilic immethodical impolitic importless imprudent inadvisable inane inanimate inanimated inauthentic inchoate incoherent inconclusive incongruous inconsequent inconsequential inconsiderate inconsistent indiscreet indiscriminate inept inert inexpedient infatuated injudicious insane insensate insensible insensitive insentient insignificant invalid irrational irregular kooky lackbrained lean-minded lean-witted lifeless loco loony loose ludicrous lunatic mad maddened manic maudlin mazed meaningless mental mentally deficient meshuggah mindless misadvised misguided misshapen moon-struck moronic mute myopic narcotized nirvanic nitwitted non compos non compos mentis nonconnotative nonconscious nondenotative nonliving nonscientific nonsensical nonsymmetrical nonsystematic nonuniform not all there not bright not following not right null numbed nutty oblivious odd of little brain of unsound mind off orderless out out cold out of it paralogical pea-brained phatic pin-brained planless pointless promiscuous psycho purportless purposeless queer random reasonless reckless ridiculous sappy scrambled screwy self-annulling self-contradictory self-refuting semiconscious sentimental shapeless shortsighted sick silly slackminded slackwitted soulless spaced out spasmodic sporadic stark-mad stark-staring mad stoned straggling straggly strange strung out stunned stupid surd systemless tetched thoughtless touched trinal unadvised unanimated unarranged unauthentic unaware unbalanced unclassified unconnected unconscious unconsidered undirected undiscerning unfeeling unforeseeing ungifted ungraded