The phrase "am out of order" suggests that something or someone is not functioning properly or is behaving inappropriately. Some possible antonyms for this phrase might include "am in order," "am functioning correctly," "am behaving properly," or "am in control." Other antonyms could include "am composed," "am calm," or "am collected." These words suggest a sense of being in control, organized, and level-headed. In contrast, "am out of order" implies a lack of control or a sense of chaos. Choosing the right antonym for this phrase depends on the context and the specific meaning you are trying to convey.