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