definition of
tenacious

[1] #1 tenacious a. [retentive, recollective, long] good at remembering; "a retentive mind"; "tenacious memory". wn

[2] #2 tenacious s. [dogged, dour, persistent, pertinacious, unyielding] 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". wn

[3] #3 tenacious s. [coherent] sticking together; "two coherent sheets"; "tenacious burrs". wn