anomalous

from WordNet (r) 3.0 (2006)

anomalous
    adj 1: deviating from the general or common order or type;
           "advanced forms of life may be anomalous in the universe"

from The Collaborative International Dictionary of English v.0.48

Anomalous \A*nom"a*lous\, a. [L. anomalus, Gr. ? uneven,
   irregular; 'an priv. + ? even, ? same. See {Same}, and cf.
   {Abnormal}.]
   Deviating from a general rule, method, or analogy; abnormal;
   irregular; as, an anomalous proceeding.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

73 Moby Thesaurus words for "anomalous":
      aberrant, abnormal, absurd, amorphous, anomalistic, atypical,
      crank, crankish, cranky, crotchety, deviant, deviative, different,
      disproportionate, divergent, dotty, eccentric, erratic,
      exceptional, fey, flaky, foreign, formless, freakish, funny,
      heteroclite, heteromorphic, idiocratic, idiosyncratic, incoherent,
      incommensurable, incommensurate, incompatible, incongruous,
      inconsequent, inconsistent, inconsonant, irreconcilable, irregular,
      kinky, kooky, maggoty, monstrous, nutty, odd, oddball, off-key,
      out of proportion, oxymoronic, paradoxical, peculiar,
      preternatural, prodigious, queer, quirky, screwball, screwy,
      self-contradictory, shapeless, singular, strange, stray, straying,
      subnormal, twisted, unconventional, unnatural, unregular,
      unrepresentative, untypical, wacky, wandering, whimsical