Synonyms to undervaluing

disparaging, abusive, aweless, back-biting, belittling, bitchy, blackening, blameful, calumniatory, calumnious, catty, censorious, condemnatory, contemptuous, contumelious, damnatory, defamatory, denunciatory, deprecative, deprecatory, depreciative, depreciatory, derisive, derisory, derogative, derogatory, detracting, detractory, disadvantageous, discourteous, disrespectful, execrating, execrative, execratory, impudent, insolent, invective, inveighing, irreverent, judgmental, libelous, minimizing, objurgatory, pejorative, priggish, reproachful, reprobative, reviling, ridiculing, scandalous, scoffing, scurrile, scurrilous, slanderous, slighting, uncomplimentary, underrating, vilifying, vituperative