The antonyms for the phrase "am nice" are plentiful, and they vary in degrees of negativity. Some antonyms include "am mean," "am cruel," "am spiteful," "am callous," and "am nasty." These words are the opposite of being kind, friendly, and generous. Antonyms can also be found in the approach and demeanor of a person. For example, someone who is "am indifferent," "am apathetic," or "am disinterested" may not actively display cruelty or negativity, but they are not actively displaying kindness, either. It's essential to understand the various antonyms for the phrase "am nice" to be aware of their negative connotations and to strive for a more positive approach in our daily interactions with others.