This is the 11873rd most frequent Polish word.
kryminalnym
"Criminal" (adjective relating to crime).
In this sentence, 'kryminalnym' relates to the genre of crime, as in television or literature.
Jestem fanem kryminalnych seriali.
I am a fan of crime series.
Here, 'kryminalnym' describes the type of investigation as related to crimes.
Ten film opowiada o kryminalnym śledztwie.
This movie is about a criminal investigation.
In this context, 'kryminalnym' refers to the department that deals with criminal activities.