Synonyms of unmusical

1 Syllable
rude, harsh
2 Syllables
jangly, clinker, grating, scratchier, harshest, clashing, roiled, harsher, squally, strident, squawky, squallier, jarring, scratchy, raucous, off-key, jangling, off-pitch, off-tone
3 Syllables
quarreling, absonant, discrepant, contrary, incongruous, divergent, disagreeing, stridulous, tuneless, untuned, stertorous, atonal, contrarient, different, out-of-key, out-of-tune, dissonant, discordant
4 Syllables
disharmonic, uncongenial, inconsonant, cacophonic, inharmonic, disharmonious, cacophonous, vociferant, unmelodious, opposite, unharmonious, unmixable, inconsistent
5 Syllables
antagonistic, antipathetic, incompatible, contradictory