Synonyms for Not all there:

• adj.

  •bananas (adjective)
  • crazy,
  • wacky,
  • disturbed,
  • maniac,
  • psycho,
  • sick.
  •brainsick (adjective)
  • crazed,
  • disordered.
  •fruity (adjective)
  • loony,
  • off.
  •ignorant (adjective)
  • unaware.
  •loco (adjective)
  • mental,
  • frenzied,
  • around the bend,
  • unsettled,
  • idiotic,
  • psychopathic,
  • irresponsible,
  • Derailed,
  • impractical,
  • wrong,
  • paranoid,
  • preposterous,
  • schizophrenic,
  • rabid,
  • wild,
  • fatuous,
  • raging,
  • raving,
  • senseless.
  •oblivious (adjective)
  • inattentive,
  • absorbed,
  • forgetful,
  • negligent,
  • unobservant,
  • incognizant,
  • overlooking,
  • neglectful,
  • distracted,
  • heedless,
  • unmindful,
  • dreamy,
  • Forgetting,
  • gone,
  • unconcerned,
  • deaf,
  • absentminded,
  • zonked,
  • spacey,
  • unknowing,
  • unconscious,
  • preoccupied,
  • Blundering,
  • unwitting,
  • insensible,
  • abstracted,
  • regardless,
  • careless,
  • uninformed,
  • uninstructed,
  • unacquainted,
  • blind,
  • Disregardful.
  •touched (adjective)
  • bizarre,
  • out of mind,
  • fanatic,
  • obsessed,
  • peculiar,
  • pixilated.
  •unaware (adjective)
  • unenlightened,
  • unsuspecting,
  • nescient,
  • daydreaming,
  • caught napping,
  • Mooning,
  • not cognizant,
  • deaf to,
  • out cold,
  • doped,
  • in a daze.
  •unbalanced (adjective)
  • flaky,
  • unstable,
  • troubled,
  • erratic,
  • freaky.

• n.

  •absent-minded (noun)
  • Absent-minded.
  •careless (noun)
  • mindless.
  •deranged (noun)
  • insane.

• Other synonyms:

  •
  • crackers,
  • brainsick,
  • fruity,
  • batty,
  • bananas,
  • Daffy,
  • mentally ill,
  • bonkers,
  • dotty.
  •
  • demented,
  • daft,
  • maniacal,
  • buggy,
  • screwy,
  • nutty,
  • non compos mentis,
  • cracked,
  • distraught.
  •
  • moonstruck.
  •Other relevant words:
  • potty,
  • paranoiac,
  • exceptional,
  • loopy,
  • burbling,
  • faraway,
  • Driveling,
  • delirious,
  • abnormal,
  • mongoloid,
  • flighty,
  • certifiable,
  • balmy,
  • mazed,
  • Mentally Handicapped,
  • simple,
  • retarded,
  • quirky,
  • not right,
  • lunatic,
  • absent,
  • twisted,
  • queer,
  • spacy,
  • mentally defective,
  • mad,
  • half-baked,
  • backward,
  • out of one's mind,
  • deranged,
  • psychotic,
  • barmy,
  • subnormal,
  • cretinous,
  • Deluded,
  • arrested,
  • crackbrained,
  • bereft,
  • ill,
  • goofy,
  • neurotic,
  • dippy,
  • nuts,
  • gaga,
  • kooky,
  • Non compos,
  • cuckoo,
  • defective,
  • schizo,
  • maddened,
  • irrational,
  • mentally deficient,
  • half-witted,
  • Luny,
  • bugs,
  • bereft of reason,
  • hallucinated,
  • unsound,
  • wandering,
  • out of it,
  • cretinistic,
  • kinky,
  • bats,
  • somewhere else,
  • imbecile,
  • witless,
  • odd,
  • imbecilic,
  • maundering,
  • schizoid,
  • out to lunch,
  • Drooling,
  • elsewhere,
  • meshuga,
  • unhinged,
  • bughouse,
  • strange,
  • blithering,
  • out of one's head,
  • looney,
  • dithering,
  • babbling,
  • Crack-brained,
  • off one's head,
  • moronic,
  • off-the-wall,
  • berserk,
  • slobbering,
  • wanting,
  • tetched,
  • not bright,
  • eccentric,
  • meshuggah,
  • psychoneurotic.

Antonyms for Not all there:

• adj.

  • bananas
    healthy, sensible.
  • oblivious
    concerned, sensitive, mindful, conscious, understanding, aware, attentive.
  • touched
    sane, ok, unemotional, unmoved, untouched, well.
  • unaware
    careful, suspicious, caring, cognizant, informed, knowing.
  • unbalanced
    fair, even, just, strong, stable, balanced, sound, steady.