keen relish; hearty enjoyment; gusto.

an agreeable or piquant flavor imparted to something.

anything added to impart flavor, enhance one's appreciation, etc.

piquancy; interest; charm.

liveliness or energy; animating spirit.

the peel, esp. the thin outer peel, of a citrus fruit used for flavoring

lemon zest.

to give zest, relish, or piquancy to.

noun

blandness , dullness , apathy , indifference , laziness , lethargy

noun

bite , body , charm , flavoring , ginger , guts * , interest , kick * , nip , piquancy , punch * , pungency , relish , salt , savor , seasoning , smack * , snap * , spice , tang , zap * , zip *notes:zeal pertains to a keen interest while zest is keen enjoyment or added interest , appetite , ardor , bliss , bounce , cheer , delectation , delight , eagerness , ecstasy , elation , enjoyment , enthusiasm , fervor , happiness , keenness , moxie * , passion , pep * , pleasure , relish * , satisfaction , zeal , zing *notes:zeal pertains to a keen interest while zest is keen enjoyment or added interest , sapor , smack , taste , gusto , flavor , joie de vivre , lust , oomph , pep , pizzazz , vitality , zing