Source : Webster's Revised Unabridged Dictionary (1913)

Adventuresome \Ad*ven"ture*some\, a.
   Full of risk; adventurous; venturesome. --
   {Ad*ven"ture*some*ness}, n.

Source : WordNet®

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