"Hits the bull's eye" is an idiomatic expression that means achieving something exactly or precisely. The antonyms for this phrase depend on the context in which it is used. If used in a competitive context, the antonyms could include "missed the target," "failed to achieve the goal," or "fell short of expectations." In a social context, antonyms could include "off-target," "imprecise," or "inaccurate." In an academic or intellectual context, antonyms could include "imprecise," "vague," or "unclear." Ultimately, the antonyms for "hits the bull's eye" convey the opposite of achieving a precise or exact outcome.