Definitions
1.adjectiveHaving an acidic, sharp or tangy taste."Lemons have a sour taste."
2.adjectiveMade rancid by fermentation, etc."Don't drink that milk; it's turned sour."
3.adjectiveTasting or smelling rancid."His sour breath makes it unpleasing to talk to him."
4.adjective(of a person's character) Peevish or bad-tempered."He gave me a sour look."
5.adjective(of soil) Excessively acidic and thus infertile."a sour marsh"
6.adjective(of petroleum) Containing excess sulfur."sour gas smells like rotten eggs"
7.adjectiveUnfortunate or unfavorable.
8.adjectiveOff-pitch, out of tune.
9.nounThat which makes something sour.