Retentive

Full definition of retentive

Adjective

1. Having power to retain; as, a retentive memory.
• c. 1599, William Shakespeare, ''Julius Caeser', Act 1 Scene 3Nor airless dungeon, nor strong links of iron, Can be retentive to the strength of spirit.

Noun

1. (obsolete) That which retains or confines; a restraint.