contumacious
adjective
stubbornly perverse or rebellious; willfully and obstinately disobedient.
Contumacious “stubbornly perverse or rebellious” is derived from the noun contumacy “obstinate resistance to authority,” ultimately from the Latin adjective contumāx “unyielding, stubborn.” The -tum- element in contumāx is of uncertain origin, but there are two hypotheses. The definition-based theory connects -tum- to the verb temnere “to despise,” which is also the source of the stem tempt-, as in contempt, while the spelling-based theory connects -tum- to the verb tumēre “to swell,” the source of tumescent and tumor. Contumacious was first recorded in English in the 1590s.
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