brazen

Short definition from Wiktionary

Adjective

1. 1
   Made of brass.
2. 2
   Brass-like in appearance or character; bright, ruddy, hard.
3. 3
   Sounding harsh and loud, like brass cymbals or brass instruments.
4. 4
   Extremely strong; impenetrable; resolute.
5. 5
   Shameless or impudent; shocking or audacious; brash.

Verb

1. 1
   To turn a brass color.
2. 2
   Generally followed by out or through: to carry through in a brazen manner; to act boldly despite embarrassment, risk, etc.