Other forms: skimpier; skimpiest
When something is skimpy, there's not quite enough of it. A skimpy lunch won't fill you up, and a skimpy sweater won't cover you up.
The adjective skimpy is good for describing meager or inadequate things, like a skimpy amount of firewood that only burns for an hour, or a skimpy serving of ice cream. Skimpy probably comes from the verb scrimp, "be thrifty," which was originally an adjective meaning "scant or meager."