Etymology
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pertinacious (adj.)

"unyielding, persistent, resolute" (in holding to a purpose, opinion, course of action, etc.), 1620s, from pertinacy "stubbornness" (late 14c.), from Latin pertinacia, from pertinax "very firm, tenacious" (see pertinacity) + -ous. Related: Pertinaciously.

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Definitions of pertinacious

pertinacious (adj.)
stubbornly unyielding; "a mind not gifted to discover truth but tenacious to hold it"- T.S.Eliot;
the most vocal and pertinacious of all the critics
From wordnet.princeton.edu