pertinacious

Adjective
  1. Stubbornly unyielding (synset 302335561)
    "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"; "men tenacious of opinion"
    similar to: obstinate, stubborn, unregenerate - tenaciously unwilling or marked by tenacious unwillingness to yield
    same as: dogged, dour, persistent, tenacious, unyielding

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