moxie
[noun]
Synonyms: energy, birr, go, hardihood, pep, potency, tuck, vigor, courage, cojones, dauntlessness, guts, heart, mettle, pluck, resolution, spirit, spunk, fortitude, backbone, grit, intestinal fortitude, nerve, sand

[TahlilGaran] English Synonym Dictionary ▲

mox‧ie /ˈmɒksi $ ˈmɑː-/ noun [uncountable] American English informal
[Date: 1900-2000; Origin: Moxie, a trademark for a type of drink]
courage and determination:
He’s a small kid, but he has plenty of moxie.

[TahlilGaran] Dictionary of Contemporary English ▲