Here's what rhymes with improbantibus.
                        
                        
                    
                                Words that almost rhyme with improbantibus
mantissas  passiveness  mannishness  draughtiness  attractiveness  massiveness  lavishness  clannishness  caddishness  faddishness  waggishness  brackishness  harelips  raffishness  laddishness  rabidness  managements  expansiveness  combativeness  impassiveness  outlandishness  snappishness  gallivants  blandishments  establishments