After having my pocket picked, I thought I learned the verb to steal, „kradit“. It turns out this is not true, as the verb (inexplicably) seems to be „krast“. Nonetheless, I began refering to a person who steals as „kradlík“. Everyone understood this word. Unfortunately, this is a neologism, and the actual word for thief is „zlodej“. Of course there is no corresponding verb „zlodit“ either. Someone seems to have stolen some verb/noun pairs. Call the language police!