Here's what rhymes with impossibilitas.
                        
                        
                    
                                Words that almost rhyme with impossibilitas
syllabus  villages  tinnitus  felicitous  villainous  epitomised  bigamous  epitomise  indigenous  diligence  dissonance  limitless  militants  silicates  solicitous  umbilicus  gingivitis  minimised  minuteness  legitimised  vertiginous  stigmatise  cheerlessness  stimulus  synthesis  ridiculous  filaments  vigilance  wickedness  antithesis  cheerfulness  frivolous  mischievous  chivalrous  vividness  fearlessness  littleness  polygamous  brittleness  fickleness  symbolise  wilfulness  victimised  visitants  willfulness  litigiousness  witlessness  ambivalence  equivalence  ligaments  meticulous  omnipotence  synchronous  virulence  dissidents  sinfulness  singleness  listlessness  religiousness  sycophants  fearfulness  legitimates  nimbleness  infelicitous  shiftlessness  ambitiousness  blissfulness  equivocates  skillfulness  winsomeness  fitfulness  timpanists  equivalents  stimulants  articulates  asynchronous  conjunctivitis  particulates  peristalsis  predicaments  precipitants  wistfulness  gesticulates  individuates  ministrants  assiduousness  nutritiousness  surreptitiousness  cymbalists  participants  magnificence  unambiguous  abolitionists  religionists  imprisonments  prohibitionists  exhibitionists  geosynchronous  grandiloquence  repetitiousness  expeditiousness  traditionalists  coreligionists  coalitionists  nonparticipants  nonequivalents