The phrase "am a consequence" suggests that something has resulted or occurred as a natural outcome of a preceding action. The opposite of this could be "am not a consequence," which implies that there is no causal relationship between the preceding action and the following event. Another antonym could be "am intentional," which would suggest that the action was taken purposefully and with the goal of achieving a specific outcome. On the other hand, "am accidental" would convey that the outcome was unintended or unexpected. Other antonyms for "am a consequence" could include "am unrelated," "am coincidental," "am unconnected," or "am inconsequential.