Being or made softer or less loud or clear:
— Muffled drums.
— The muffled noises of the street.

synonyms: dull, muted, softened.

Roget 526: latent; lurking etc. v.; secret etc. 528; occult; implied etc. v.; dormant; abeyant.    unapparent, unknown, unseen etc. 441; in the background; invisible etc. 447; indiscoverable^†, dark; impenetrable etc. (unintelligible) 519; unspied^†, unsuspected.    unsaid, unwritten, unpublished, unbreathed^†, untalked of^†, untold etc. 527, unsung, unexposed, unproclaimed^†, undisclosed etc. 529, unexpressed; not expressed, tacit.    undeveloped, solved, unexplained, untraced^†, undiscovered etc. 480.1, untracked, unexplored, uninvented^†.    indirect, crooked, inferential; by inference, by implication; implicit; constructive; allusive, covert, muffled; steganographic^†; understood, underhand, underground; delitescent^†, concealed etc. 528.    ... show more

Roget 405: inaudible; scarcely audible, just audible; low, dull; stifled, muffled; hoarse, husky; gentle, soft, faint; floating; purling, flowing etc. v.; whispered etc. v.; liquid; soothing; dulcet etc. (melodious) 413; susurrant^†, susurrous^†.    ... show more

Roget 408a: nonresonant^†, dead; dampened, muffled.   

Wrapped up especially for protection or secrecy.