1 : unreasonably rigid in the face of argument or entreaty or attack
2 : 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"
adjectif
1 : tenaciously unwilling or marked by tenacious unwillingness to yield
