Here's what rhymes with unprededented.
                        
                        
                    
                                dented  scented  vented  assented  demented  indented  repented  dissented  prevented  unprecedented  lamented  relented  regimented  reinvented  unscented  consented  discontented  alimented  ornamented  complemented  complimented  disoriented  underrepresented  unrepresented  misrepresented  circumvented  Words that almost rhyme with unprededented
appended  mended  wended  fended  trended  vended  distended  appendage  portended  expended  contended  commended  befriended  unattended  transcended  unintended  comprehended  pelted  bested  betted  jetted  destined  attested  detested  ejected  bedded  dejected  tepid  wetted  wrested  abetted  netted  whetted  vetted  texted  guested  stetted  rejected  embedded  wretched  dreaded  divested  fretted  leaded  redirected  sweated  untested  defected  retested  stenciled  breaded  pretested  bedimmed  gelid  pirouetted  quested  kennelled  accepted  respected  subjected  inspected  deflected  excepted  unprotected  welded  beheaded  disaffected  imbedded  intersected  molested  resected  resurrected  undetected  interjected  undigested  gazetted  preempted  presaged  reinvested  brevetted  prospected  reconnected  headwind  rearrested  trellised  unattested  bayonetted  coquetted  facetted  reinspected  sledded  towheaded  trisected  cossetted  retreaded  indirected  requested  regretted  unaffected  disconnected  exempted  recollected  disparaged  polarised  silhouetted  uncorrected  disrespected  introspected  ricochetted  vignetted  retrospected  unexpected  interconnected  unconnected  unmolested  unsuspected  misdirected  sulphuretted  uncontested  uncollected  uninfected  solemnised  depolarised  burglarised  vulgarised