Meaning : Good at remembering.
Example :
A retentive mind.
Tenacious memory.
Synonyms : long, recollective, retentive
Meaning : Stubbornly unyielding.
Example :
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.
Synonyms : dogged, dour, persistent, pertinacious, unyielding