What is the meaning of Brazen?

Pertaining to, made of, or resembling brass (in color or strength).

Sounding harsh and loud, like brass cymbals or brass instruments.

Extremely strong; impenetrable; resolute.

Shamelessly shocking and offensive; audacious; impudent; barefaced; immodest, unblushing.

To turn a brass color.

Generally followed by out or through: to carry through in a brazen manner; to act boldly despite embarrassment, risk, etc.

Source: wiktionary.org