Blacked out is a phrase that is commonly used to describe a sudden loss of consciousness or a general feeling of confusion or disorientation. However, there are various other synonyms that can be used to express the same feeling or event. Some of the synonyms that can be used instead of blacked out include fainting, passing out, losing consciousness, going blank, losing one's memory, and becoming unconscious. Each of these words conveys a slightly different meaning, but they are all effective in helping to describe the feeling of blacking out or the sudden loss of consciousness. Using synonyms can help to keep your writing fresh and varied.