“个人主义”常见的英文表达是 individualism。
例句：
His extreme individualism sometimes causes conflicts with his colleagues.（他极端的个人主义有时会引发与同事之间的冲突。）
In this society, individualism is both encouraged and balanced by a sense of community.（在这个社会里，个人主义既受到鼓励，又通过社区意识得到平衡。 ）