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"頑固なほど不屈な根暗
例：The most vocal and pertinacious of all the critics. すべての評論家の中で最もはっきりとものを言い、しつこい人。