1. Audacious
By Jane Poelman

2. Extremely bold or daring Recklessly brave; fearless Unrestrained
Definition
Audacious (Adj)
Extremely bold or daring
Recklessly brave; fearless
Unrestrained

3. Etymology
1540s
"confident, intrepid," (from L. audacia) "daring, boldness, courage" (from audax) "bold, daring," (from audere) "to dare."
1590s
Bad sense of “shameless” is attested

4. Use it in a sentence…
The audience cheered the audacious feats of the trapeze artists. (from WikiAnswers)
Although many considered her boldness offensive, Maggie's ability to ask audacious questions made her a popular news reporter. (from blurtit.com)
Surfing is for audacious individuals who don't fear sharks and giant waves. (from brainyflix.com)

5. Who/what is audacious? Skydiving Speech-giving Rosa Parks’ actions
Martin Luther King Jr.
U.S. Military
A mouse facing a cat
Surfing
Fear Factor candidates
Assertive televangelists
Crazy/“out there” fashion trends

6. Audacious things (from Brainyflix.com) (from google images)

7. Viewer Discretion is advised (esp. for sensitive stomachs)