The Collaborative International Dictionary of English v.0.48:
Inventive \In*vent"ive\, a. [Cf. F. inventif.] Able and apt to invent; quick at contrivance; ready at expedients; as, an inventive head or genius. --Dryden. -- In*vent"ive*ly, adv. -- In*vent"ive*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
inventiveness n 1: the power of creative imagination [syn: inventiveness, ingeniousness, ingenuity, cleverness]