Here's what rhymes with immediatefy.
                        
                        
                    
                                high  thy  vi  hi  shy  sigh  fi  hy  thigh  vie  psi  hai  cy  fy  sy  thei  phi  by  my  why  apply  die  dry  lie  try  y  buy  fly  sky  guy  tie  bi  bye  chi  defy  dye  nigh  pi  pie  spy  thai  dei  fry  ly  ply  quae  rye  sly  ty  wir  awry  lye  mai  muy  nai  pry  tri  trie  wry  kai  lai  luy  mei  pri  tai  wai  sty  deify  stye  turfy  slier  supply  cry  deny  belie  untie  edify  aquae  bonsai  spry  amebae  beatify  banzais  yuppify  reply  thereby  imply  justify  rely  comply  hereby  modify  testify  butterfly  certify  goodbye  notify  underlie  nullify  pacify  ratify  beautify  decry  pupae  terrify  typify  amoebae  codify  descry  overlie  resupply  acidify  ossify  retry  triply  ultrahigh  blowfly  stupefy  lanai  scurfy  versify  barfly  mummify  prettify  shanghai  ripply  speechify  overbuy  dandify  identify  nearby  satisfy  whereby  multiply  specify  simplify  verify  gratify  purify  alibi  alveoli  amplify  fortify  magnify  rectify  samurai  standby  unify  lullaby  solidify  termini  dignify  mollify  mortify  ramify  vilify  demystify  firefly  mystify  stratify  stultify  vivify  emulsify  horrify  misapply  petrify  reunify  overfly  vitrify  drachmai  gentrify  syllabify  occupy  clarify  nuclei  qualify  alkali  classify  signify  glorify  intensify  quantify  diversify  falsify  indemnify  crucify  liquefy  objectify  oversupply  personify  dragonfly  electrify  calcify  dissatisfy  liquify  scarify  refortify  stimuli  exemplify  detoxify  preoccupy  reclassify  revivify  declassify  hyperbolae  misidentify  solemnify  disqualify  oversimplify  cumuli  transmogrify