Source : Webster's Revised Unabridged Dictionary (1913)

Venturesome \Ven"ture*some\, a.
   Inclined to venture; not loth to run risk or danger;
   venturous; bold; daring; adventurous; as, a venturesome boy
   or act. -- {Ven"ture*some*ly}, adv. -- {Ven"ture*some*ness},
   n.

Source : WordNet®

venturesomeness
     n : the trait of being adventurous [syn: {adventurousness}]