Having a pleasant sound:
— A euphonious trill of silver laughter.

synonym: euphonous.

Roget 580: vocal, phonetic, oral; ejaculatory, articulate, distinct, stertorous; euphonious etc. (melodious) 413.   

Roget 413: harmonious, harmonical^†; in concord etc. n., in tune, in concert; unisonant^†, concentual^†, symphonizing^†, isotonic, homophonous^†, assonant; ariose^†, consonant.    measured, rhythmical, diatonic^†, chromatic, enharmonic^†.    melodious, musical; melic^†; tuneful, tunable; sweet, dulcet, canorous^†; mellow, mellifluous; soft, clear, clear as a bell; silvery; euphonious, euphonic, euphonical^†; symphonious; enchanting etc. (pleasure-giving) 829; fine-toned, full-toned, silver-toned.    ... show more

Roget 578: elegant, polished, classical, Attic, correct, Ciceronian, artistic; chaste, pure, Saxon, academical^†.    graceful, easy, readable, fluent, flowing, tripping; unaffected, natural, unlabored^†; mellifluous; euphonious, euphemism, euphemistic; numerose^†, rhythmical.    felicitous, happy, neat; well put, neatly put, well expressed, neatly expressed ... show more

of speech or dialect Pleasing in sound; not harsh or strident.