kontrowersyjny sporny Englisch:

I do little very little contentious work; most of my time is spent drafting contracts.

contentious claim, proceeding

That is not a contentious issue; a nominal budget line of one billion euros should be maintained.

The book raises some quite contentious issues.

She has some very contentious views on education.

And even if they stuck around, a post-mortem is very contentious.

contentious nature of research

a quite contentious nature of research

a quite contentious nature of research; contentious issue