Definition of stick-to-itness in English:

stick-to-itness

noun

informalNorth American
  • The ability or capacity to see a course of action through to its completion; dogged perseverance.

Origin

Late 19th century; earliest use found in Atlantic (Iowa) Daily Telegraph. From to stick to it + -ness.

Pronunciation

stick-to-itness

/ˌstɪkˈtuːɪtnɪs/