Synonyms of tuneless

1 Syllable

hard, bleak, sharp, sour, harsh, flat, grim, rough, dry

2 Syllables

coarse, craggy, rusty, grating, jagged, rugged, harshest, clashing, glaring, harsher, rasping, raspy, rigid, squawky, cracked, strident, acrid, jarring, scratchy, hoarse, raucous, noisy, creaking, bitter, croaking, jangling, off-key, screeching, scratchier

3 Syllables

asperous, disturbing, unlevel, guttural, disagreeing, uneven, stridulous, severe, astringent, earsplitting, out-of-key, out-of-tune, dissonant, discordant

4 Syllables

unrelenting, unmusical, cacophonic, cacophonous, caterwauling, unmelodious

5 Syllables

incompatible