Here's what rhymes with uncertain.
                        
                        
                    
                                certain  curtain  Words that almost rhyme with uncertain
surgeon  burden  werden  turban  bourbon  sturgeon  worden  wurden  unburden  burgeon  suburban  exurban  overburden  interurban  neurosurgeon  version  sermon  zircon  person  assertion  conversion  urine  insertion  aversion  inversion  burthen  worsen  personne  mermen  coercion  diversion  exertion  immersion  workman  desertion  perversion  reversion  subversion  churchmen  incursion  churchman  aspersion  reinsertion  nonperson  determine  dispersion  excursion  recursion  transferrin  reassertion  submersion  churchwarden  introversion  animadversion  overexertion  interspersion  trencherman  anchorperson  weatherperson  businessperson  redetermine  extraversion  extroversion  predetermine  congressperson