Here's what rhymes with undell.
                        
                        
                    
                                bundle  trundle  Words that almost rhyme with undell
umbel  humble  frontal  tumble  jumble  rumble  fumble  mumble  bumble  rumple  gumball  crumble  stumble  grumble  crumple  prefrontal  disgruntle  uncial  tunnel  funnel  muddle  puddle  tional  huddle  cuddle  appal  runnel  gunnel  fuddle  awol  double  couple  muscle  subtle  uncle  bubble  puzzle  bustle  muzzle  rubble  shovel  shuttle  buckle  chuckle  rustle  shuffle  suppl  supple  hovel  hustle  knuckle  muffle  mussel  publ  ruffle  tuple  cudgel  juggle  suckle  tussle  caecal  rappel  guzzle  nuzzle  pummel  tamale  tousle  jugful  tubful  mugful  trouble  jungle  fungal  autumnal  colourful  ductile  nuptial  stubble  conformal  ductal  lustful  scuffle  scuttle  smuggle  subtile  phrasal  pustule  snaffle  snuggle  truffle  bungle  playable  truckle  befuddle  duckbill  lungful  snuffle  tumbrel  addable  cupsful  struggle  crustal  rebuttal  friable  dirigible  redouble  trustful  decouple  reshuffle  uncouple  vocable  unbuckle  acquirable  flyable  beatable  tamable  kerfuffle  pinocle  triumphal  bestowal  damnable  peduncle  prenuptial  attachable  nonvocal  unplayable  vincible  oversubtle  honeysuckle  thermocouple  carbuncle  nonviable  filtrable  unnameable  ignitable  unlikable  dividable  heptagonal  unloveable  conformable  antifungal  distrustful  suboptimal  uncharitable  mistrustful  unbridgeable  containable  duodecimal  granduncle  imperishable  subcortical  imperturbable  exploitable  unarguable  compoundable  indissoluble  translatable  transmutable  untranslatable  indemonstrable