(a.) Having lost its life and spirit; dead; spiritless; insipid; flat; dull\; unanimated; as, vapid beer; a vapid speech; a vapid state of the blood.

airy arid asinine barren betwixt and between blah bland blank bloodless boring catchpenny changeable characterless cold colorless common commonplace dead dilute diluted dismal draggy drearisome dreary driveling dry dryasdust dull dusty effete elephantine empty empty-headed empty-minded empty-pated empty-skulled etiolated fade fair fair to middling fairish fatuous flat flavorless flimsy foolish fribble fribbling frivolous frothy futile gruelly halfhearted heavy ho-hum hollow humdrum idle inane indecisive indifferent inexcitable infirm of purpose infirm of will innocuous insipid irresolute jejune lackluster leaden lifeless light low-spirited matter-of-fact mediocre medium middling mild milk-and-water milky moderate modest mundane mushy namby-pamby neutral nugacious nugatory of a kind of a sort of sorts ordinary otiose pale pallid pappy passable pedestrian plain plodding poetryless pointless poky ponderous prosaic prosing prosy pulpy rattlebrained rattleheaded respectable sapless savorless scatterbrained shallow silly slender slight slow so-so solemn spiceless spiritless stale sterile stiff stodgy stuffy superficial tame tasteless tedious thin tiresome tolerable trifling trite trivial unembellished unflavored unidealistic unimaginative unimpassioned uninteresting unlively unpalatable unpoetic unromantic unsavory vacant vacuous vain washy watered watered-down watery weak wearisome wearying windy wishy-washy wooden