The Collaborative International Dictionary of English v.0.48:
gumptious \gumptious\ adj. 1. enterprising. Syn: energetic, industrious, up-and-coming. [WordNet 1.5 +PJC]WordNet (r) 3.0 (2006):
gumptious adj 1: working hard to promote an enterprise [syn: energetic, gumptious, industrious, up-and-coming]