Indefatigableness

Full definition of indefatigableness

Noun

1. The state of being indefatigable.
• 1829, Memoir, Correspondence, and Miscellanies: from the papers of Thomas Jefferson:. . . but too much security on the republican part will give time to his talents and indefatigableness to extricate them.

Synonyms

• indefatigability, persistence, stamina, tirelessness