Of a sound: awful, sickening; (also) harsh or disagreeable to the ear, discordant.

Of sounds. (Passing into sense A. 6)

Unpleasant to the ear.

Harsh-sounding, discordant, dissonant. Also figurative. Now rare.

(setting the teeth on edge).

= horrisonant, adj.

Sounding horribly; of terrible sound.

Of sounds.

(a) that sounds ordinary or usual; (b) (depreciative) that sounds unrefined, vulgar, or coarse.

That lacerates; cutting, piercing; harrowing. Chiefly figurative.

Ill-sounding, having a harsh or unpleasant sound.

(un-, prefix1 affix 2.)

Ill-sounding.

Impossible or unbearable to listen to. Frequently in unlistenable-to.

(un-, prefix1 affix 1.)

Not euphonious.