Here's what rhymes with immutably.
                        
                        
                    
                                inscrutably  immeasurably  irrefutably  indisputably  abominably  interminably  Words that almost rhyme with immutably
badly  sadly  madly  haply  gladly  cadre  flatly  tally  dally  tabby  tali  bally  valley  manly  rally  taxi  daddy  galley  paddy  shabby  chassis  dandy  patchy  sally  baggy  bandy  chatty  tacky  bani  cabbie  cabby  chancy  pansy  panty  patty  taffy  tangy  batty  blackly  chanty  gangly  jazzy  pappy  tansy  tatty  carry  happy  fancy  fatty  sandy  brandy  candy  handy  lastly  nasty  vastly  ghastly  radii  verbally  pantry  shaggy  blandly  blankly  canny  flabby  hackney  lanky  nanny  savvy  shanty  waxy  brassy  catchy  lackey  laddie  lassie  trashy  caddy  catty  drafty  draughty  fanny  hanky  maxi  nappy  natty  navvy  palfrey  raspy  ratty  rectally  sappy  sassy  straggly  wacky  caddie  campy  crabby  frankly  scanty  glassy  grassy  crafty  fiancee  finale  clammy  craggy  flashy  grandly  classy  communally  cranky  cranny  gantry  grandee  granny  lamprey  snappy  bastardy  scraggly  exactly  unhappy  uncanny  chimpanzee  granary  yeomanry  compactly  intermarry  miscarry  scratchy  vacantly  inaptly  pederasty  scraggy  scrappy  efficacy  abstractly  homeopathy  necromancy  polyandry  vigilante  inefficacy  angioplasty  homoeopathy  osteopathy  sycophancy  satisfactory  profligacy