razumljivo

1. intelligibly; clearly
   Profesor objašnjava veoma razumljivo. — The professor explains things very clearly.
   Govori polako i razumljivo, molim te. — Please speak slowly and clearly.
2. (as a sentence comment) understandably; naturally
   Posle svega, bila je, razumljivo, veoma ljuta. — After all that, she was understandably very angry.

In "to je razumljivo" ("that's understandable") the same form works as a predicate.