retentive

Adjective
  1. Good at remembering (synset 302012852)
    "a retentive mind"; "tenacious memory"
    also: aware, mindful - bearing in mind; attentive to
    same as: long, recollective, tenacious
  2. Having the capacity to retain something (synset 303122620)
  3. Having the power, capacity, or quality of retaining water (synset 301777459)
    "soils retentive of moisture"
    similar to: impermeable - preventing especially liquids to pass or diffuse through

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