WordNet (r) 3.0 (2006):

overstuffed
    adj 1: upholstered thickly and deeply; "an overstuffed sofa"

Moby Thesaurus II by Grady Ward, 1.0:

78 Moby Thesaurus words for "overstuffed":
   SRO, allayed, bloated, brimful, brimming, bulging, bursting,
   capacity, chock-full, choked, chuck-full, cloyed, congested,
   cram-full, crammed, crowded, disgusted, distended, drenched,
   engorged, farci, fed-up, filled, filled to overflowing, flush,
   full, full of, full to bursting, glutted, gorged, hyperemic,
   in spate, jaded, jam-packed, jammed, overblown, overburdened,
   overcharged, overfed, overflowing, overfraught, overfreighted,
   overfull, overgorged, overladen, overloaded, oversaturated,
   overstocked, oversupplied, overweighted, packed,
   packed like sardines, plenary, plethoric, ready to burst, replete,
   round, running over, sated, satiated, satisfied, saturated,
   sick of, slaked, soaked, standing room only, stuffed, stuffed up,
   supercharged, supersaturated, surcharged, surfeited, swollen,
   tired of, topful, with a bellyful, with a snootful,
   with enough of