Muffled rhymes with:
reshuffled, ruffled, scuffled, shuffled, unruffled, baffled, reshuffled, rifled, ruffled, scaffold, scuffled, shuffled, stifled, unruffled, waffled
Muffled sounds like:
manifold, manipulate, manipulated, maplewood, mayfield, minefield, minnifield, mobility, mofield, muffoletto, mumbled