Words That Rhyme With "Unfasten" :
2 syllables:
aasen, assen, bason, bauson, bison, bisson, boisen, bossen, bosun, Bryson, bussen, caisson, casson, cautioned, chasen, chasten, christen, classen, clausen, cresson, crossen, Dawson, Dowson, dressen, Essen, friesen, frison, glisten, goosen, gossan, grafen, grison, hasten, hessen, housen, husen, hyson, Jason, lassen, Lawson, lessen, lesson, listen, loosen, mason, messan, moisten, nessen, nicen, Nisan, oscine, pawson, Preussen, rossen, sachsen, Sison, Swanson, thissen, Tyson, Watson, yesen
3 syllables:
aglisten, assassin, Freemason, rechristen