Maybe you'd be interested in the raisins I buy for my toddler? The package says
Perfekt skrynklade sötnosar att stoppa i brödbak, hemgjord müsli eller i någon som är lite sur.
Perfectly wrinkled sweeties for putting in bread, homemade cereals, or someone who's a little grumpy.
There may be comments in some of the other exercises that surly is not related to sur, but several English-Swedish online dictionary choices give sur as the first choice for a translation of surly (though Google translate seems to relegate it to a second choice). Apparently some sort of convergent evolution going on here!