Here's what rhymes with unreactive.
                        
                        
                    
                                reactive  nonreactive  inactive  proactive  nonactive  attractive  interactive  radioactive  refractive  unattractive  overactive  hyperactive  retroactive  vasoactive  psychoactive  nonradioactive  counteractive  extractive  immunoreactive  putrefactive  Words that almost rhyme with unreactive
captive  massive  passive  adaptive  maladaptive  combative  contrastive  impassive  expansive