ballsiness

adjective, balls·i·er, balls·i·est. Slang: Vulgar.

1. boldly aggressive or courageous: a ballsy gal who isn’t afraid of anyone.

adjective

1. slang courageous and spirited

adj.

“courageous, masculine,” 1959, first attested in Norman Mailer (writing of Truman Capote); see balls + -y (2).