The antonyms for the phrase "am brought about" are varied and depend on the context in which it is used. In general, antonyms for this phrase would suggest actions or situations opposite to the one that has been brought about, such as "am cancelled," "am prevented," or "am undone." These antonyms imply a failure or inability to achieve the desired outcome. Alternately, antonyms for "am brought about" could also indicate that an event was not caused intentionally, as in "am coincidental" or "am accidental." In any case, the antonym for "am brought about" would suggest that the situation is different from what was originally intended.