vapid

As an adjective vapid

is lifeless, dull or banal.

As a noun zest is

the outer skin of a citrus fruit, used as a flavouring or garnish.

As a verb zest is

to scrape the zest from a fruit.

As an adjective vapid

is lifeless, dull or banal.

As a noun vap is

(obsolete) that which is vapid, insipid, or lifeless; especially, the lifeless part of liquor or wine.