(bound form) diligent; hard-working; often used in the phrase 孜孜 zī​zī to describe unwearied effort

(bound form) a Chinese surname

(bound form) used in the compound 孜煎 zī​jiān meaning to be anxious or worried

(bound form) used in the compound 喜孜孜 xǐ​zī​zī to describe a state of joy or happiness