Antonyms for the phrase "am kind to" would be any words or phrases that convey the opposite meaning of kindness. Some of the antonyms could be harsh, cruel, unkind, rude, unpleasant, hurtful, inconsiderate, impolite, uncaring, and merciless. All these words reflect negative attributes that are completely opposite to kindness, leaving people in a state of discomfort, agitation and unhappiness. While "am kind to" signifies treating someone with generous acts, words, and consideration, its antonyms indicate an action of cruelty and disrespect towards others. Therefore, it is always advisable to keep kindness at the forefront and practice it, as it fosters goodwill and creates a harmonious relationship.