sour

sour (http://definr.com/sour)

     adj 1: smelling of fermentation or staleness [syn: rancid]
     2: having a sharp biting taste [ant: sweet]
     3: one of the four basic taste sensations; like the taste of
        vinegar or lemons
     4: in an unpalatable state; "sour milk" [syn: off, turned]
     5: inaccurate in pitch; "a false (or sour) note"; "her singing
        was off key" [syn: false, off-key]
     6: showing a brooding ill humor; "a dark scowl"; "the
        proverbially dour New England Puritan"; "a glum, hopeless
        shrug"; "he sat in moody silence"; "a morose and
        unsociable manner"; "a saturnine, almost misanthropic
        young genius"- Bruce Bliven; "a sour temper"; "a sullen
        crowd" [syn: dark, dour, glowering, glum, moody,
         morose, saturnine, sullen]
     n 1: a liquor (especially whiskey or gin) mixed with lemon or
          lime juice and sugar
     2: the taste experience when vinegar or lemon juice is taken
        into the mouth [syn: sourness, tartness]
     3: the property of being acidic [syn: sourness, acidity]
     v 1: go sour or spoil; "The milk has soured"; "The wine worked";
          "The cream has turned--we have to throw it out" [syn: turn,
           ferment, work]
     2: make sour or more sour [syn: acidify, acidulate, acetify]
        [ant: sweeten]