Here's what rhymes with unretentiveness.
retentiveness attentiveness inventiveness inattentiveness Words that almost rhyme with unretentiveness
pensiveness tenseness restiveness denseness festiveness effectiveness defensiveness defectiveness offensiveness perceptiveness protectiveness receptiveness deceptiveness intensiveness objectiveness repressiveness comprehensiveness penitence possessiveness suggestiveness extensiveness oppressiveness apprehensiveness contentedness expensiveness obsessiveness aggressiveness reticence connectedness ineffectiveness impressiveness unexpectedness inexpensiveness inoffensiveness scarceness caribous residence expressiveness headmistress progressiveness celibates hesitance fetishists residents collectivists disconnectedness embellishments counterintelligence