Reserve the adjective vapid for the airhead in your office who brings nothing to the table, except maybe the doughnuts. Vapid is an adjective to describe someone or something that is dull or uninspiring.
"We prefer not to consider the shockingly vapid and primitive comments uttered by athletes in postcontest interviews," David Foster Wallace wrote. The word was originally used in English in a much more literal sense, describing beverages that lacked flavor. It comes from the Latin word vapidus, literally "having exhaled its vapor."