Antonyms for the phrase "devoted oneself to" include "ignored," "neglected," "abandoned," "disregarded," and "neglected." These words imply a lack of attention or care towards something, the opposite of putting oneself wholeheartedly into a pursuit. Other antonyms could include "uncommitted," "indifferent," "distracted," and "aloof." These words suggest a lack of focus or interest in a particular subject, further contrasting with the notion of complete devotion. While these antonyms may seem negative or dismissive, they do provide a useful contrast with the idea of being committed and dedicated to a cause or goal.