The antonyms for the phrase "concerned oneself" would be words or phrases that suggest a lack of interest or involvement. Some examples of antonyms could be "ignored," "uninvolved," "disinterested," "aloof," "apathetic," or "detached." These words suggest a lack of care or attention, indicating that the individual is not invested in the situation or problem at hand. It is important to note that these antonyms are not synonyms for "concerned oneself." They simply offer an alternative perspective on how one might respond to a particular issue or challenge. So, depending on the context, using antonyms of "concerned oneself" could help create a nuanced meaning and better convey the intended message.