sour

I. a.

1.

Acid, tart, pricked, sharp, acetous, acetose.

2.

Cross, crabbed, morose, acrimonious, currish, surly, testy, touchy, cantankerous, crusty, fretful, peevish, petulant, pettish, snappish, waspish, snarling, cynical, froward, uncivil, rude, rough, harsh, ill-tempered, ill-natured, austere.

3.

Bitter, unpleasant, disagreeable.

4.

Gloomy, sad, dismal, morose, discontented, austere.

5.

Rancid, musty, spoiled, bad, coagulated, turned, curdled, loppered.

II. v. a.

1.

Make acid, turn sour.

2.

Imbitter, make unpleasant.

III. v. n.

Turn sour, become acid.