Contentious, open to debate (13)
I believe the answer is:
controversial
(Other definitions for controversial that I've seen before include "Contentious" , "Likely to cause disagreement" , "At issue" , "Causing heated debate" , "Tendentious" .)
I believe the answer is:
controversial
(Other definitions for controversial that I've seen before include "Contentious" , "Likely to cause disagreement" , "At issue" , "Causing heated debate" , "Tendentious" .)