Here's what rhymes with underdefended.
                        
                        
                    
                                defended  descended  depended  tended  offended  ascended  extended  intended  attended  splendid  amended  apprehended  blended  emended  subtended  undefended  upended  suspended  pretended  condescended  reprehended  untended  misapprehended  recommended  superintended  overextended  Words that almost rhyme with underdefended
invented  rented  tented  presented  percentage  resented  cemented  fermented  oriented  augmented  represented  contented  implemented  documented  supplemented  reoriented  headed  threaded  wedded  shredded  fetid  melded  second  method  mentioned  settled  effected  vested  herald  legged  reddened  bareheaded  disheveled  dishevelled  petted  sectioned  deadened  meddled  peddled  penciled  pencilled  pensioned  felted  foetid  hefted  pedaled  affected  elected  threatened  arrested  detected  erected  infected  invested  legend  tested  indebted  melted  reckoned  rested  welcomed  lessened  perfected  dissected  infested  leveled  levelled  nested  beckoned  nestled  speckled  wrestled  belted  beveled  freckled  revelled  smelted  bevelled  chested  deafened  dissembled  freshened  leavened  nettled  reveled  bedeviled  jested  lightheaded  expected  directed  selected  assembled  corrected  injected  objected  tempted  resembled  ingested  lengthened  unsettled  crested  intrepid  breasted  inflected  resettled  trebled  embezzled  imperiled  semiarid  connected  suggested  attempted  collected  protected  reflected  projected  questioned  suspected  protested  strengthened  trembled  intercepted  disinfected  reelected  disassembled  millisecond  unmentioned  neglected  manifested  contested  congested  unquestioned  predestined  reassembled  complexioned