The Collaborative International Dictionary of English v.0.48:
Rhymeless \Rhyme"less\, a. Destitute of rhyme. --Bp. Hall. [1913 Webster]WordNet (r) 3.0 (2006):
rhymeless adj 1: not having rhyme; "writing unrhymed blank verse is like playing tennis without a net" [syn: unrhymed, unrimed, rhymeless, rimeless] [ant: rhymed, rhyming, riming]