Synonyms for sour

modified

1. Sour in taste

   acid, acidulated, tart, acetous, vinegary, fermented, rancid, musty, turned, acidulous, acetose, acidic, salty, bitter, acrid, caustic, cutting, stinging, peppery, harsh, irritating, unsavory, vitriolic, tangy, vinegarish, briny, brackish, astringent, dry, sharp, keen, biting, pungent, piquant, acerb*, acerbic, acetic, curdled, foxy, sourish, subacid, green, unripe, acescent, with a kick*.

   Antonyms sweet*, mild, bland.

2. Sour in temper

   on edge, ill-natured, grouchy; see irritable.

sour usually implies an unpleasant sharpness of taste and often connotes fermentation or rancidity sour milk; acid suggests a sourness that is normal or natural a lemon is an acid fruit; acidulous suggests a slightly sour or acid quality acidulous spring water; tart suggests a slightly stinging sharpness or sourness and usually connotes that this may be pleasant to the taste a tart cherry pie

verb