Not rhymable, having no perfect rhymes.(adjective)
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Use "rhymeless" in a sentence
"As I write this, all the beings and happenings of that other world rise up before me in vast phantasmagoria, and I know that to you they would be rhymeless and reasonless."
"But the time was at hand, rhymeless and reasonless so far as I can see, when I was to begin to pay for my score of years of dallying with John Barleycorn."
"My dreams, if dreams they may be called, were rhymeless and reasonless."