The antonyms for the phrase "asserted oneself" include "yielded," "surrendered," "submitted," and "deferred." These terms describe a lack of confidence, surrendering to the opinions and wills of others, and giving up on personal goals and desires. Those who do not assert themselves may become passive, indecisive, or submissive, and may struggle to succeed in their personal and professional lives. It is important for individuals to find a healthy balance between asserting themselves and being receptive to the thoughts and feelings of others, but complete surrender or submission is not a suitable alternative.