retentive, recollective, long, tenacious -- (good at remembering; "a retentive mind"; "tenacious memory")
dogged, dour, persistent, pertinacious, tenacious, 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")
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