tenacious

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”

(of memory) having greater than average range

• “a long memory especially for insults”
• “a tenacious memory”

sticking together

• “two coherent sheets”
• “tenacious burrs”