loony

loony
    adj 1: informal or slang terms for mentally irregular; "it used
           to drive my husband balmy" [syn: {balmy}, {barmy},
           {bats}, {batty}, {bonkers}, {buggy}, {cracked},
           {crackers}, {daft}, {dotty}, {fruity}, {haywire},
           {kooky}, {kookie}, {loco}, {loony}, {loopy}, {nuts},
           {nutty}, {round the bend}, {around the bend}, {wacky},
           {whacky}]
    n 1: someone deranged and possibly dangerous [syn: {crazy},
         {loony}, {looney}, {nutcase}, {weirdo}]
    

loony \loon"y\ (l[=oo]n"[y^]), a. [Shortened fr. lunatic.]
   1. Crazy; insane; lunatic; mentally unsound. [Low, U.S.]
      [Written also {loony}, {luny} and {looney}.] See {Luny}.
      [1913 Webster]

   2. Very foolish; very impractical; as, loony ideas.
      [PJC]
    

loony \loony\ (l[=oo]n"[y^]) n.
   someone mentally deranged and possibly dangerous.

   Syn: crazy, looney, weirdo, psycho.
        [WordNet 1.5]
    

Luny \Lu"ny\, a. [Shortened fr. lunatic.]
   Crazy; insane; mentally unsound. [Written also {loony} and
   {looney}.] [Low, U.S.]
   [1913 Webster]
    

89 Moby Thesaurus words for "loony":
      absurd, apish, asinine, balmy, bananas, barmy, bats, batty, beany,
      bedlamite, befooled, beguiled, besotted, bonkers, brainless,
      buffoonish, buggy, bughouse, bugs, cockeyed, crackers, crazy,
      credulous, cuckoo, daffy, daft, dazed, dement, dippy, dizzy,
      doting, dotty, dumb, fatuitous, fatuous, flaky, flipped, fond,
      fool, foolheaded, foolish, freaked-out, fruitcakey, fruity,
      fuddled, futile, gaga, goofy, gulled, harebrained, haywire,
      idiotic, imbecile, inane, inept, infatuated, insane,
      just plain nuts, kooky, loon, loopy, mad, madman, maniac, maudlin,
      moronic, non compos, nut, nuts, nutty, off the hinges,
      off the track, off the wall, potty, preposterous, round the bend,
      sappy, screwball, screwballs, screwy, senseless, sentimental,
      silly, slaphappy, stupid, thoughtless, wacky, wet, witless