[syn: unmelodious, unmelodic, unmusical]
The Collaborative International Dictionary of English v.0.48:
Unmusical \Unmusical\
   See musical.
WordNet (r) 3.0 (2006):
unmusical
    adj 1: lacking interest in or talent for music; "too unmusical
           to care for concerts"; "it is unfortunate that her
           children were all nonmusical" [syn: unmusical,
           nonmusical] [ant: musical]
    2: not musical in nature; "the unmusical cry of the bluejay"
       [syn: unmusical, nonmusical] [ant: musical]
    3: lacking melody [syn: unmelodious, unmelodic, unmusical]
       [ant: melodic, melodious, musical]
Moby Thesaurus II by Grady Ward, 1.0:
35 Moby Thesaurus words for "unmusical":
   absonant, atonal, 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, untunable, untuned, untuneful