adj. 25B6; adjective ENERGETIC, spirited, active, lively, zestful, vital, vigorous, forceful, powerful, positive; high-powered, aggressive, bold, enterprising; magnetic, passionate, fiery, high-octane; informal go-getting, peppy, full of get-up-and-go, full of vim and vigour, gutsy, spunky, feisty, go-ahead.
half-hearted.