Antonyms for the phrase "flaked out" would be "energized," "alert," "awake," "animated," and "refreshed." To "flake out" means to suddenly lose energy or motivation, which is the opposite of feeling rejuvenated and ready to take on the day. Similarly, "flaked out" can also mean to cancel plans or fail to follow through on commitments, whereas antonyms such as "dependable," "responsible," "reliable," and "committed" signify a sense of follow-through and accountability. Depending on the context, there are numerous antonyms for "flaked out," each of which offers an alternative perspective on how to approach a situation with a sense of focus and vitality.