pertinacious

adj : stubbornly unyielding; "dogged persistence"; "dour

determination"; "the most vocal and pertinacious of all

the critics"; "a mind not gifted to discover truth but

tenacious to hold it"- T.S.Eliot; "men tenacious of

opinion" [syn: {bulldog}, {dogged}, {dour}, {tenacious},

{unyielding}]