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The Collaborative International Dictionary
Pervicacious

Pervicacious \Per`vi*ca"cious\, a. [L. pervicax, -acis.] Obstinate; willful; refractory. [Obs.] -- Per`vi*ca"cious*ly, adv. -- Per`vi*ca"cious*ness, n.

Wiktionary
pervicacious

a. stubborn, willful, obstinate, refractory