controversially
US /ˌkɑːn.trəˈvɝː.ʃəl.i/
UK /ˌkɑːn.trəˈvɝː.ʃəl.i/

1.
in a manner that is likely to cause public disagreement or argument
:
•
The new policy was controversially implemented without public consultation.
•
He controversially claimed that the Earth is flat.