Here's what rhymes with prosprous.
                        
                        
                    
                                prowess  leprous  Words that almost rhyme with prosprous
loudmouth  brownness  allowance  loudness  doubtless  countess  cloudless  roundness  bounteous  foulness  stoutness  roundups  countless  boundless  soundness  groundless  soundless  devoutness  groundnuts  thousandths  profoundness  viscountess  accountants  endowments  unsoundness  mountebanks  announcements  pronouncements  denouncements