The Swedish word for sour is
sur

Translations for sour and their definitions

sur	©
1. adj. sour; the characteristic taste of a lemon
2. adj. acetous; having a sour taste
3. adj. acidic
4. adj. angry, annoyed
Jag blir så jäkla sur när han gör så där - I get so damn angry when he does that
5. adj. bad, sour (of a feeling or the like)
Det känns surt att vi förlorade - It feels bad that we lost
6. adj. wet, damp (of something that should be dry)
sura strumpor - wet socks