Of sound or the voice: gentle, low, soft; of little power or strength; not loud, harsh, or rough. Occasionally also: thin, shrill.

Pleasing to the ears; pleasant-sounding. Of a sound, the voice, etc.: low, quiet, subdued; not loud, harsh, or rough. Also: melodious, pleasing…

Of a sound, music, etc.: soft, low, quiet, subdued; not loud or harsh.

Of sound, the voice, etc.: not loud; quiet, low, subdued. Cf. soft, adj. 2b(a).

Of sound, form, colour, etc.: soft and liquid; delicately modulated.

Of sound, music, a voice, etc.: warm-toned; soft and gentle; full, rich; without harshness.

figurative. Made gentler or more pleasing; esp. softened in sound.

In reference to colour or light (rarely, sound): Of fine or delicate quality or nature; soft, subdued; not deep, strong, or glaring.

Of Sounds: Soft, low.

Of sounds: Soft, not harsh or grating.

figurative. Unusually or attractively smooth, soft, or gentle.