"wine that has lost its flavor," c. 1600, from Latin vappa "wine without flavor," figuratively "a good-for-nothing" (see vapid).
Entries linking to vappa
vapid adj.
1650s, "flat, insipid" (of drinks), from Latin vapidus "flat, insipid," literally "that has exhaled its vapor," related to vappa "stale wine," and probably to vapor "vapor." Applied from 1758 to talk and writing deemed dull and lifeless. Related: Vapidly; vapidness.