/kənˈtenʃəs/
con·ten·tious
BrE /kənˈtenʃəs/
NAmE /kənˈtenʃəs/
(formal)
likely to cause disagreement between people
a contentious issue/topic/subject
Both views are highly contentious.
OPP uncontentious
liking to argue; involving a lot of arguing
a contentious meeting