The phrase "am of advantage" means that something is beneficial or advantageous, but there are several antonyms that express the opposite meaning. The first antonym is "disadvantageous," which describes something that is harmful, unfavorable, or detrimental. Another antonym is "detrimental," which refers to something that has a negative impact or causes harm. "Harmful" and "bad" are two other antonyms that convey the opposite of advantage. Finally, "unprofitable" and "unbeneficial" describe something that does not provide any benefit or advantage. Understanding antonyms for "am of advantage" can help us to better communicate both positive and negative meanings in our writing and speech.