acerb, acerbic
sour
acid
surly
sulky
tart
acidic
sour-tasting
vinegarish, vinegary
sore
morose, sullen
grumpy
sour, acid in taste
sour, peevish, irritable, grumpy, fretful, ill-tempered
acidic, acid
felsic
(inflection of)
rotten