Source : Webster's Revised Unabridged Dictionary (1913)

Adventurous \Ad*ven"tur*ous\, a. [OE. aventurous, aunterous, OF.
   aventuros, F. aventureux, fr. aventure. See {Adventure}, n.]
   1. Inclined to adventure; willing to incur hazard; prone to
      embark in hazardous enterprise; rashly daring; -- applied
      to persons.

            Bold deed thou hast presumed, adventurous Eve.
                                                  --Milton.

   2. Full of hazard; attended with risk; exposing to danger;
      requiring courage; rash; -- applied to acts; as, an
      adventurous undertaking, deed, song.

   Syn: Rash; foolhardy; presumptuous; enterprising; daring;
        hazardous; venturesome. See {Rash}.

Source : WordNet®

adventurous
     adj : willing to undertake or seeking out new and daring
           enterprises; "adventurous pioneers"; "the risks and
           gains of an adventuresome economy" [syn: {adventuresome}]
           [ant: {unadventurous}]