As a Noun:
1. The quality you show when you have decided to do something and you will not let anything stop you. English = determination.
2. Something which someone cannot stop thinking or worrying about. English = obsession.
As a Verb or Adjective:
1. To have a firm decision to do something and to not let anything stop you. English = (be) determined.
2. To be unable to stop thinking about something, to have your thoughts on one thing all the time. English = (be) obsessed (with something), (be) obsessive.