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.

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Definitions of vapid from WordNet

vapid (adj.)
lacking taste or flavor or tang;
vapid tea
vapid beer
Synonyms: bland / flat / flavorless / flavourless / insipid / savorless / savourless
vapid (adj.)
lacking significance or liveliness or spirit or zest;
a vapid conversation
a vapid smile
a bunch of vapid schoolgirls