Definition of "contentious"

Ukraine, however, will complain long and hard about a contentious second-half incident when Marko Devic's shot clearly crossed the line before it was scrambled away by John Terry, only for the officials to remain unmoved.

2012 June 19, Phil McNulty, “England 1-0 Ukraine”, in BBC Sport‎

She was not a contentious person as the Other had been; she did not argue and contradict everything I said.

2020, Susanna Clarke, Piranesi, Bloomsbury, page 212