Here's what rhymes with perspicaciousness.
graciousness tenaciousness audaciousness spaciousness flirtatiousness capaciousness salaciousness vivaciousness loquaciousness voraciousness Words that almost rhyme with perspicaciousness
heinousness courageousness caginess nakedness faithlessness shamelessness weightlessness shapelessness painlessness gracelessness jadedness patroness wakefulness gratefulness painfulness contagiousness blamelessness chasteness hatefulness shamefulness statelessness tastelessness caplets fatefulness safeness balefulness maintenance faithfulness changeless playfulness gracefulness wastefulness brazenness racialists tastefulness ungratefulness cartilaginous unfaithfulness wavelets distastefulness disgracefulness conservationists mucilaginous