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contumacious

/ˌkɒn.tjʊˈmeɪ.ʃəs/ adjective

In Latin: contumax Wiktionary

Origin

From Latin contumāx (“stubborn, obstinate”) + -ious. By surface analysis, contum(ax) + -acious.

From Wiktionary, via Kaikki.org (CC BY-SA)