atonal

from WordNet (r) 3.0 (2006)

atonal
    adj 1: characterized by avoidance of traditional western
           tonality [syn: {atonal}, {unkeyed}] [ant: {tonal}]

from Moby Thesaurus II by Grady Ward, 1.0

35 Moby Thesaurus words for "atonal":
      absonant, cacophonous, cracked, diaphonic, disconsonant,
      discordant, disharmonic, disharmonious, dissonant, flat, grating,
      harsh, immelodious, inharmonic, inharmonious, musicless,
      nonmelodious, off, off-key, off-tone, out of pitch, out of tone,
      out of tune, raucous, sharp, shrill, sour, strident, tuneless,
      unharmonious, unmelodious, unmusical, untunable, untuned,
      untuneful