The Collaborative International Dictionary of English v.0.48:
zesty \zest"y\ (z[e^]st"[-e]), adj. Having a pleasantly stimulating flavor. Opposite of bland. Syn: piquant, spicy, savory, savoury. [WordNet 1.5] 2. marked by spirited enjoyment. Syn: zestful, yeasty. [WordNet 1.5]WordNet (r) 3.0 (2006):
zesty adj 1: having an agreeably pungent taste [syn: piquant, savory, savoury, spicy, zesty] 2: marked by spirited enjoyment [syn: zestful, yeasty, zesty, barmy]