Stiffed rhymes with:
tifft, tift, adrift, clift, credithrift, drift, fork-lift, gift, lift, miffed, riffed, rift, shift, shrift, sift, sniffed, swift, thrift, tifft, tift
Stiffed sounds like:
seedpod, stabbed, staffed, staved, steeped, stepped, steptoe, stooped, stopped, stubbed, stuff-it, stuffed, stupid, stupidity, sudafed