Synonyms for Harebrain:

• n.

  •blockhead (noun)
  • noodle,
  • ninny,
  • bust,
  • moron,
  • oaf,
  • chump,
  • simpleton,
  • tomfool,
  • jackass,
  • nincompoop.
  •bungler (noun)
  • dunce,
  • fumbler,
  • blunderer,
  • muddlers,
  • foul-up,
  • foulup,
  • fools,
  • featherbrain,
  • idiot,
  • goofball,
  • ignoramus,
  • muffer,
  • clod,
  • numskull,
  • clumsy oaf,
  • screw up,
  • bumbler,
  • donkey,
  • duffer,
  • mismanagers,
  • Muddler,
  • spoiler,
  • bonehead,
  • duffers,
  • spoilers,
  • klutz,
  • butterfingers,
  • goof off,
  • fumblers,
  • incompetent,
  • bumblers,
  • addlebrain,
  • fool,
  • botcher,
  • butcher,
  • Mismanager,
  • dolt,
  • incompetents.
  •nut (noun)
  • non compos mentis,
  • fiend,
  • bedlamite,
  • loony,
  • eccentric,
  • zealot,
  • Dement,
  • freak,
  • loonies,
  • bigot,
  • fanatic.

• Other synonyms:

  •eccentric
  • kook.
  •Other relevant words:
  • scatterbrain,
  • screwball,
  • dizzy,
  • flibbertigibbet,
  • witless,
  • rattlebrain,
  • rattlebrained,
  • Giddy-headed,
  • Rattlehead,
  • featherbrained,
  • ding-a-ling,
  • madman,
  • rattleheaded,
  • birdbrain,
  • scatterbrained,
  • featherhead,
  • Giddy-brained,
  • giddy,
  • addlehead,
  • fluttery,
  • thoughtless,
  • nutcase,
  • harebrained,
  • hoity-toity,
  • rattlepated,
  • codger,
  • brainless,
  • Rattlepate,
  • crank,
  • WACK,
  • addlepate,
  • weirdo,
  • lunatic,
  • dimwit,
  • lamebrain,
  • maniac,
  • anomaly,
  • crackbrain,
  • cuckoo,
  • frivolous,
  • empty-headed,
  • dingbat,
  • gaga,
  • scatterbrains.

Antonyms for Harebrain:

• n.

  • bungler
    genius, brain, success.
  • nut
    sane person.