Here's what rhymes with extensionless.
dimensionless Words that almost rhyme with extensionless
expressionless baroness benefits pectoris prejudice parenthesis nemesis expressionists selflessness pessimists secessionists clematis insurrectionists segregates medalists therapists existentialists protectionists impressionists receptionists eugenicists orientalists projectionists belletrists nepotists carcinogenesis fundamentalists instrumentalists interventionists polemicists supremacists parthenogenesis anesthetists environmentalists psychotherapists transcendentalists hypnotherapists physiotherapists radiotherapists