Synonyms for Sick in the head:

• adj.

  •bananas (adjective)
  • out of one's mind,
  • nuts,
  • out to lunch,
  • kooky,
  • deranged,
  • disturbed,
  • psycho,
  • wacky,
  • cuckoo,
  • mad,
  • unsound,
  • sick,
  • crazy,
  • unhinged,
  • maniac,
  • lunatic.
  •brainsick (adjective)
  • crazed,
  • psychotic,
  • disordered.
  •loco (adjective)
  • loony,
  • irresponsible,
  • frenzied,
  • mental,
  • impractical,
  • senseless,
  • preposterous,
  • irrational,
  • paranoid,
  • wild,
  • Derailed,
  • around the bend,
  • unsettled,
  • raving,
  • idiotic,
  • fatuous,
  • of unsound mind,
  • raging,
  • rabid,
  • off,
  • wrong,
  • schizophrenic,
  • psychopathic,
  • bizarre.

• Other synonyms:

  •
  • crackers,
  • mentally ill,
  • fruity,
  • dotty,
  • bananas,
  • Daffy,
  • batty,
  • brainsick,
  • bonkers,
  • loco.
  •
  • demented,
  • nutty,
  • maniacal,
  • distraught,
  • unbalanced,
  • screwy,
  • buggy,
  • daft,
  • cracked,
  • non compos mentis.
  •
  • moonstruck,
  • touched.
  •Other relevant words:
  • gaga,
  • insane.

Antonyms for Sick in the head:

• adj.

  • bananas
    healthy, sensible, sane.