Sour

1. Having an acidic, sharp or tangy taste.
2. Made rancid by fermentation, etc.
3. Tasting or smelling rancid.
4. (of a person's character) Peevish or bad-tempered.
5. (of soil) Excessively acidic and thus infertile.
6. (of petroleum) Containing excess sulfur.
7. Unfortunate or unfavorable.
8. (music) Off-pitch, out of tune.

Antonyms

• (petroleum): sweet