孜孜不倦 zīzībùjuàn diligent and tireless Origin Definitions Defs Strokes Stroke Words Sentences Sents 孜 zī reduplication diligent (bound form) diligent; hard-working; often used in the phrase 孜孜 zīzī to describe unwearied effort不倦 bùjuàn adjective tireless to not feel tired or weary; untiring; indefatigable; often used to describe someone who is diligent or hardworking