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Adjective: retentive  ri'ten-tiv
  1. Good at remembering
    "a retentive mind";
    - recollective, long, tenacious
  2. Having the capacity to retain something
  3. Having the power, capacity, or quality of retaining water
    "soils retentive of moisture"

See also: aware, impermeable, mindful

Antonym: unretentive