From Wiktionary, the free dictionary
Borrowed from Old Church Slavonic оусръдиѥ (usrŭdije, “effort, zealousness”).
osârdie f (plural osârdii)
- (popular, dated) zeal, fervor (in regards to work or an endeavor); industry
- Synonyms: zel, râvnă, sârguință, silință, stăruință
