perfectionism UK /pəˈfɛk.ʃ(ə).nɪ.z(ə)m/US /pɚˈfɛk.ʃə.nɪ.zm̩/ noun2 •An unwillingness to settle for anything less than perfection. •A belief that spiritual perfection may be achieved during life, or that it should be striven for. formsperfectionisms