contentious

Etymology

From Middle French contentieux, from Latin contentiōsus (“quarrelsome, perverse”), from contentiō (“contention”), from contendere, past participle contentus (“to contend”). Equivalent to English contention + -ous.

adj

1. Marked by heated arguments or controversy.
   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. June 19, 2012, Phil McNulty, “England 1-0 Ukraine”, in BBC Sport
2. Given to struggling with others out of jealousy or discord.
   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