self-discipline

UK: /ˌsɛlfˈdɪsɪplɪn/ US: (self′dis′ə plin, self′-)

WordReference Random House Unabridged Dictionary of American English © 2025

self-dis•ci•pline  (self′dis′ə plin, self′-), n. 

1. discipline and training of oneself, usually for improvement:
   Acquiring the habit of promptness requires self-discipline.

• 1830–40

self′-dis′ciplined, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::

self-discipline noun

1. the act of disciplining or power to discipline one's own feelings, desires, etc, esp with the intention of improving oneself

ˌself-ˈdisciplined adjective