Contumacious is from the Latin word contumāx (“stubborn, obstinate”)
Stubbornly perverse or rebellious; willfully and obstinately disobedient.
Or stubbornly resistant to authority; willfully obstinate
"She sat still, looking a little contumacious, and very much indisposed to stir."
~Charlotte Bronte, Shirley
contrary, pigheaded, factious, refractory,