1. tasteless, insipid; dull, boring. vapidvapid , a. [l. vapidus having lost its lire and spirit, vapid; akin to vappa vapid wine, vapor vapor. see: vapor.] having lost its life and spirit; dead; spiritless; insipid; flat; dull; unanimated; as, vapid beer; a vapid speech; a vapid state of the blood. a cheap, bloodless reformation, a guiltless liberty, appear flat and vapid to their taste. -- vapid*ly (#), adv. -- vapid*ness , n.vapid adj