umarati

1. (+ acc.) to tire; to wear out
   Ovaj posao me strašno umara. — This job wears me out terribly.
   Duga putovanja umaraju decu. — Long trips tire children out.
2. (umarati se) to get tired
   Brzo se umaram kad trčim uzbrdo. — I get tired quickly when I run uphill.

The perfective is umoriti.