adventurous

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Inclined to undertake new and daring enterprises.
• adjective Requiring or characterized by boldness or daring; hazardous; risky.

from The Century Dictionary.

• Inclined or willing to incur hazard or engage in adventures; bold to encounter danger; daring; venturesome; courageous; enterprising.
• Full of hazard; attended with risk; exposing to danger; requiring courage; hazardous: as, an adventurous undertaking.
• Synonyms Adventurous, Enterprising, Rash, Reckless, Foolhardy, venturesome, venturous. The adventurous man incurs risks from love of the novel, the arduous, and the bold, trusting to escape through the use of his bodily and mental powers; he would measure himself against difficult things. When this spirit does not go so far as to deserve the name of rashness or foolhardiness, it is considered a manly trait. The enterprising man is alert to undertake new and large things, not necessarily involving risk; he is constantly breaking out of routine. The rash man hastens to do a thing with little thought of the consequences, and generally in the heat of feeling. With the foolhardy man the risks are so great and the absence of thought is so entire that he seems to have the hardihood of the fool. The reckless man has the impetuosity of the rash man, but he is more careless of consequences. The rash man is too precipitate; the reckless man shows temerity; the foolhardy man is careless or defiant even when he undertakes the impossible.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Inclined to adventure; willing to incur hazard; prone to embark in hazardous enterprise; rashly daring; -- applied to persons.
• adjective Full of hazard; attended with risk; exposing to danger; requiring courage; rash; -- applied to acts.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective of a person Inclined to adventure; willing to incur risks; prone to embark in hazardous enterprise; rashly daring.
• adjective Full of hazard; attended with risk; exposing to danger; requiring courage; rash.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective willing to undertake or seeking out new and daring enterprises