unethical

from WordNet (r) 3.0 (2006)

unethical
    adj 1: not conforming to approved standards of social or
           professional behavior; "unethical business practices"
           [ant: {ethical}]

from Moby Thesaurus II by Grady Ward, 1.0

44 Moby Thesaurus words for "unethical":
      amoral, conscienceless, corrupt, corrupted, criminal, crooked,
      dark, devious, dishonest, dishonorable, doubtful, dubious, evasive,
      felonious, fishy, fraudulent, ill-got, ill-gotten, immoral,
      indirect, insidious, mercenary, not kosher, questionable, rotten,
      shady, shameless, shifty, sinister, slippery, suspicious, tricky,
      unconscienced, unconscientious, unconscionable, underhand,
      underhanded, unprincipled, unsavory, unscrupulous,
      unstraightforward, venal, without remorse, without shame