Here's what rhymes with callous.
                        
                        
                    
                                callus  palace  malice  phallus  digitalis  Words that almost rhyme with callous
caliph  atlas  anise  caliphs  gallops  balance  axis  campus  canvas  lattice  ballots  abbots  cactus  canvass  gametes  hapless  matchless  classless  gadgets  gratis  pallets  captious  gallants  palates  palettes  pathless  scallops  shallots  absence  status  anxious  habits  madness  sadness  talents  actress  facets  rabbits  tablets  carrots  gladness  landless  mattress  hamlets  backups  badness  factious  fatness  hammocks  hatchets  maggots  thankless  trackless  anklets  aptness  caskets  faggots  flatus  gaskets  paddocks  rackets  tactless  practice  apparatus  planets  barracks  baskets  brackets  imbalance  pamphlets  patents  bandits  blackness  magnets  adjuncts  flatness  vastness  fascists  fastness  mantras  pageants  savants  unbalance  casements  catchments  fractious  slackness  tyrannous  blankets  exactness  frankness  banquets  inhabits  handcuffs  tangents  blankness  pianists  fragments  disastrous  attachments  combatants  counterbalance  reactants  compactness  bankrupts  commandments  detachments  enactments  instalments  malpractice  embankments  advancements  enhancements  abstractness  benefactress  enchantments  propagandists  noncombatants