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A synonym for "muffled" is silenced. An antonym for "muffled" is unblocked. Please see the related link below.
lusterless, muted, dry, dead, dim, lifeless, dark, dull
The word "quiet" is the opposite of noisy and contains a D.
Definition of low-key in the Online Dictionary. ... muted, played down, understated, muffled, toned down, low-pitched The wedding will be a very low-key affair.
Loud: deafening, cacophonous, thunderous. Soft: gentle, muffled, muted.