Here's what rhymes with unplausible.
                        
                        
                    
                                plausible  implausible  Words that almost rhyme with unplausible
possible  washable  purchasable  impossible  probable  laudable  lockable  horrible  improbable  watchable  soluble  nominal  proximal  portable  topical  deplorable  follicle  forcible  nautical  adorable  chargeable  inaudible  voluble  solvable  unstoppable  fordable  monocle  chlorophyl  coracle  karakul  remarkable  abdominal  marginal  particle  cardinal  cortical  affordable  carnival  conjugal  constable  methodical  orthogonal  carbonyl  torsional  corpuscle  farcical  pronominal  tetragonal  barnacle  resolvable  unsolvable  fontanel  rechargeable  importable  adoptable  equatable  revolvable  gemological  enlargeable  responsible  proportional  hierarchical  anatomical  canonical  doctrinal  insoluble  phenomenal  allegorical  apocryphal  enforceable  oratorical  aeronautical  cytological  etymological  unenforceable  unremarkable  supportable  exhaustible  tortoiseshell  antiparticle  insolvable  rhapsodical  gemmological  nonenforceable  nonchargeable  irresponsible  inexhaustible  cosmological  insupportable  exportable  oligarchical  transportable  entomological  gerontological  scatological  submarginal  seismological  anthropological  epistemological  disproportional  phantasmagorical