sour

having an acid taste, resembling that of vinegar, lemon juice, etc.; tart.

Antonyms:

sweet

rendered acid or affected by fermentation; fermented.

producing the one of the four basic taste sensations that is not bitter, salt, or sweet.

characteristic of something fermented.

a sour smell.

distasteful or disagreeable; unpleasant.

Synonyms:

unsatisfactory, subpar, suboptimal, bitter

below standard; poor.

It was a sour effort all around, the kind of effort that doesn't exactly inspire confidence.

harsh in spirit or temper; acrimonious; disagreeable; peevish.

Synonyms:

severe, crabbed, petulant, cross, touchy, testy

Agriculture. (of soil) having excessive acidity.

(of gasoline or the like) contaminated by sulfur compounds.

Music. off-pitch; badly produced.

a sour note.

something that is sour.

any of various cocktails consisting typically of whiskey or gin with lemon or lime juice and sugar and sometimes soda water, often garnished with a slice of orange, a maraschino cherry, or both.

any of various beers with a particularly acidic or tart taste, made so by acid-producing bacteria and yeast in the brew.

Sours are a good choice to go with deep-fried bar food.

an acid or an acidic substance used in laundering and bleaching to neutralize alkalis and to decompose residual soap or bleach.

to become sour, rancid, mildewed, etc.; spoil.

Milk sours quickly in warm weather. The laundry soured before it was ironed.

to become unpleasant or strained; worsen; deteriorate.

Relations between the two countries have soured.

to become bitter, disillusioned, or disinterested.

I guess I soured when I learned he was married.

My loyalty soured after his last book.

Agriculture. (of soil) to develop excessive acidity.