SOFTENED
dull, muffled, muted, softened
(adjective) being or made softer or less loud or clear; “the dull boom of distant breaking waves”; “muffled drums”; “the muffled noises of the street”; “muted trumpets”
softened
(adjective) toned down
Source: WordNet® 3.1
Adjective
softened (comparative more softened, superlative most softened)
Made soft.
(linguistics) aspirated.
Verb
softened
simple past tense and past participle of soften
Source: Wiktionary
SOFTEN
Sof"ten, v. t. [imp. & p. p. Softened; p. pr. & vb. n. Softening.]
Definition: To make soft or more soft. Specifically: --
(a) To render less hard; -- said of matter.
Their arrow's point they soften in the flame. Gay.
(b) To mollify; to make less fierce or intractable.
Diffidence conciliates the proud, and softens the severe. Rambler.
(c) To palliate; to represent as less enormous; as, to soften a
fault.
(d) To compose; to mitigate; to assuage.
Music can soften pain to ease. Pope.
(e) To make calm and placid.
All that cheers or softens life. Pope.
(f) To make less harsh, less rude, less offensive, or less violent,
or to render of an opposite quality.
He bore his great commision in his look, But tempered awe, and
softened all he spoke. Dryden.
(g) To make less glaring; to tone down; as, to soften the coloring of
a picture.
(h) To make tender; to make effeminate; to enervate; as, troops
softened by luxury.
(i) To make less harsh or grating, or of a quality the opposite; as,
to soften the voice.
Sof"ten, v. i.
Definition: To become soft or softened, or less rude, harsh, severe, or
obdurate.
Source: Webster’s Unabridged Dictionary 1913 Edition