1) Describing certain music 2) Describing some music 3) Discordant 4) Discordant to many an ear 5) Discordant type of music 6) Discordant, musically 7) Disregarding keys 8) Dissonant 9) Ear-jarring, musically 10) Hard on the ear 11) Hard on the ears musically 12) Hard to hum 13) Hardly melodic 14) Hardly melodious 1) Unked 2) Unkeyed 
[adj] - (music) characterized by avoidance of traditional Western tonality
atonal Music that is played without harmony; lacking harmony; unharmonious.
unkeyed adjective characterized by avoidance of traditional Western tonality
Music that is written and performed without regard to any specific key.
of, pertaining to, or marked by atonality.