Emily Dickinson Lexicon

VAP'ID, a. [L. vapidus. The radical verb is not in the Latin, but the sense must be to pass or fly off, to escape; or to strike down, L. vapulo. It is probably allied to vapor.]

1. Having lost its life and spirit; dead; spiritless; flat; as, vapid beer; a vapid state of the blood.
2. Dull; unanimated.