defame

Synonyms: asperse bad-mouth belie besmirch blacken blister calumniate cast aspersions on cast slur on denigrate detract discredit disgrace dishonor disparage do a number on knock malign pan put zingers on roast scandalize scorch slam smear speak evil of stigmatize throw mud at traduce vilify villainize vituperate

Antonyms: approve commend compliment exalt praise