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
unharmonious
unmelodious
unmusical
unsung
untunable
untuned
untuneful
antiphonal
bardic
catchy
deep-toned
ear-splitting
inaudible
lilting
long-drawn
low-pitched
melodic
melodious
music hall
one-note
plaintive
tinny
tuneful
wordless