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