Merriam-Webster Collegiate Dictionary - anomalous

 adjective  Etymology: Late Latin anomalus, from Greek anomalos, literally, uneven, from a- + homalos even, from homos same — more at same  Date: 1655  1. inconsistent with or deviating from what is usual, normal, or expected ; irregular, unusual  2.  a. of uncertain nature or classification  b. marked by incongruity or contradiction ; paradoxical  Synonyms: see irregular  • ~ly adverb  • ~ness noun