spoljašnji

1. external; outer; exterior
   Spoljašnji zid je potpuno mokar. — The outer wall is completely wet.
   Na rezultat su uticali i spoljašnji faktori. — External factors also affected the result.
2. (of appearance) outward
   Ne sudi o ljudima po spoljašnjem izgledu. — Don't judge people by their outward appearance.

In many set phrases spoljni is more usual: spoljna politika.