Individualistically is an adverb that describes how someone does something in a way that emphasizes their own self-interest or independence. Some synonyms that can be used instead of individualistically are self-reliantly, autonomously, independently, and self-sufficiently. These words convey a similar meaning as individualistically, suggesting that the person is doing things on their own terms and for their own benefit. Other synonyms include egocentrically, narcissistically, and self-centeredly, but these words have a more negative connotation and suggest a lack of consideration for others. It is essential to choose synonyms that accurately reflect the intended meaning and tone of the sentence.