The Collaborative International Dictionary of English v.0.48:

Enterprising \En"ter*pri`sing\, a.
   Having a disposition for enterprise; characterized by
   enterprise; resolute, active or prompt to attempt; as, an
   enterprising man or firm. -- En"ter*pri`sing*ly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

enterprising
    adj 1: marked by imagination, initiative, and readiness to
           undertake new projects; "an enterprising foreign policy";
           "an enterprising young man likely to go far" [ant:
           nonenterprising, unenterprising]

Moby Thesaurus II by Grady Ward, 1.0:

83 Moby Thesaurus words for "enterprising":
   active, acute, adventuresome, adventurous, aggressive, ambitious,
   animated, aspiring, assiduous, audacious, bold, brave, brisk, busy,
   courageous, craving, daring, dashing, determined, diligent,
   driving, dynamic, eager, earnest, energetic, enthusiastic,
   foolhardy, forceful, forcible, full of pep, go-ahead, go-go,
   hard-working, hardworking, hearty, hungry, hustling, impetuous,
   incisive, indefatigable, industrious, intense, itching, keen,
   kinetic, lively, living, lusty, mettlesome, overbold, peppy,
   persevering, purposeful, purposive, pushful, pushing, pushy,
   resolute, resolved, resourceful, robust, smacking, snappy,
   spanking, spirited, strenuous, strong, take-charge, take-over,
   tireless, trenchant, up-and-coming, venturesome, venturous,
   vibrant, vigorous, vivacious, vivid, yearning, zealous, zestful,
   zesty, zippy