Here's what rhymes with lengthier.
                        
                        
                    
                                Words that almost rhyme with lengthier
healthier  wealthier  readier  airier  edgier  levier  heavier  terrier  deadlier  emptier  farrier  merrier  harrier  messier  fleshier  hairier  headier  heftier  pettier  verier  warier  dressier  peppier  stealthier  fleshlier  preppier  tetchier  threadier  friendlier  steadier  sexier  scarier  sketchier  sweatier  unhealthier  stretchier  homelier  comelier  excelsior  unsteadier  unfriendlier