sur

1. formal ash-gray; gray
   Vuk je imao gustu suru dlaku. — The wolf had a thick gray coat.
2. formal (of weather, sky) gloomy; overcast
   Osvanuo je hladan i sur jesenji dan. — A cold, gloomy autumn day dawned.
3. formal (of a face, look) sullen; stern; glum
   Otac ga je pogledao surim pogledom. — His father gave him a stern look.