Answer: sour

AnswerCrossword Clue
SOURLike some grapes
SOURGrow displeased
SOURTurn bad
SOURGrumpy
SOURCrabby
SOURPeevish, as a puss
SOURSweet companion
SOURGo bad
SOURWhiskey order
SOURTurn in the fridge
SOURTart tasting
SOURKind of cream
SOURGrouchy
SOURMouth-puckering
SOURTurn
SOURAcidic
SOURLike proverbial unobtainable grapes
SOURTart-tasting
SOURUnpleasant
SOURBecome disillusioned
sourspoiled
SOURGo bad, as milk
SOURIll-humored
SOURLemon-like
SOURPucker-inducing
SOURCranky
SOUROff-key
SOURAcerbic
SOURWhisky concoction
SOUROff, as milk
SOURExcessively acid
SOUREmbitter
SOUROne of the four basic tastes
SOURLike long-neglected milk
SOUROne of the basic tastes
SOURLike crab apples
SOURLike green persimmons
SOURTurn, as milk
SOURPessimistic
SOURLike Aesop's grapes