IPA: /pəˌfɛkʃəˈnɪstɪk/
KK: /pərˈfɛkʃənɪstɪk/
Having a tendency to demand perfection or to strive for flawlessness in oneself or others.
Her perfectionistic nature often made it hard for her to be satisfied with her work.
Perfectionistic → It is formed from "perfect" (from Latin *perfectus*, meaning completed or finished) and the suffix "-istic" (meaning pertaining to or characteristic of). The word "perfectionistic" describes a tendency to strive for or emphasize perfection in behavior or standards.
Think of something that is 'completed' or 'finished' ('perfect') and how it relates to being 'characteristic of' ('-istic') that pursuit of flawlessness.