Here's what rhymes with obtusest.
                        
                        
                    
                                loosest  Words that almost rhyme with obtusest
smoothest  profusest  duellist  newest  tumult  rudest  coolest  soonest  bluest  lewdest  nudest  student  unit  prudent  coolant  cartoonist  crudest  fewest  truant  oculist  shrewdest  cruelest  hugest  bassoonist  gruesomest  movement  mutant  pursuant  fluent  inducement  adjuvant  pollutant  diluent  souvent  annuitant  intuit  rootlet  canoeist  sunhat  amusement  imprudent  impudent  mouvement  disputant  entombment  insouciant  improvement  recruitment  translucent  confluent  quadruplet