The DICT Development Group

  Unnatural \Un*nat"u*ral\ (?; 135), a.
     Not natural; contrary, or not conforming, to the order of
     nature; being without natural traits; as, unnatural crimes.
     [1913 Webster]
  
     Syn: See Factitious.
          [1913 Webster] -- Un*nat"u*ral*ly, adv. --
          Un*nat"u*ral*ness, n.
          [1913 Webster]

  unnatural
      adj 1: not in accordance with or determined by nature; contrary
             to nature; "an unnatural death"; "the child's unnatural
             interest in death" [ant: natural]
      2: not normal; not typical or usual or regular or conforming to
         a norm; "abnormal powers of concentration"; "abnormal amounts
         of rain"; "abnormal circumstances"; "an abnormal interest in
         food" [syn: abnormal, unnatural] [ant: normal]
      3: speaking or behaving in an artificial way to make an
         impression [syn: affected, unnatural] [ant: unaffected]

  174 Moby Thesaurus words for "unnatural":
     Gongoresque, Gongoristic, Marinistic, aberrant, abnormal, affected,
     amorphous, anomalistic, anomalous, apocryphal, artificial, assumed,
     bastard, bent, bestial, bizarre, bogus, brummagem, callous,
     calloused, cold, cold of heart, coldblooded, coldhearted,
     colorable, colored, contrived, counterfeit, counterfeited, crank,
     crankish, cranky, crotchety, deviant, deviative, different,
     distorted, divergent, dotty, dressed up, dummy, eccentric,
     elaborate, elaborated, embellished, embroidered, erratic, ersatz,
     euphuistic, exceptional, extraordinary, factitious, fake, faked,
     false, falsified, feigned, fey, fictitious, fictive, flaky,
     flinthearted, forced, formless, freakish, funny, garbled,
     grotesque, hard, hard of heart, hardened, hardhearted, heartless,
     heteroclite, heteromorphic, histrionic, hyperelegant, idiocratic,
     idiosyncratic, illegitimate, imitation, improper, insensitive,
     insincere, irregular, junky, kinky, kooky, la-di-da, labored,
     maggoty, make-believe, man-made, maniere, mannered, mock,
     monstrous, nutty, obdurate, odd, oddball, out of character,
     outlandish, overacted, overdone, overelaborate, overelegant,
     overnice, overrefined, peculiar, perverse, perverted, phony,
     pinchbeck, precieuse, precieux, precious, pretended, pretentious,
     preternatural, pseudo, put-on, quasi, queer, quirky, restrained,
     screwball, screwy, self-conscious, self-styled, sham, shapeless,
     shoddy, simulated, singular, so-called, soi-disant, spurious,
     stagy, stiff, stilted, stonyhearted, strange, stray, straying,
     studied, subnormal, supernatural, supposititious, synthetic,
     theatrical, tin, tinsel, titivated, tribadistic, twisted,
     unaccountable, unauthentic, uncanny, uncharacteristic,
     unconventional, unexpected, unfeeling, ungenuine, unmerciful,
     unreal, unresponsive, unseemly, unusual, wacky, wandering, warped,
     weird, whimsical