1. retentive (vs. unretentive), recollective, long, tenacious, mindful#1, aware

usage: good at remembering; "a retentive mind"; "tenacious memory"

2. retentive

usage: having the capacity to retain something

3. retentive, impermeable (vs. permeable)

usage: having the power, capacity, or quality of retaining water; "soils retentive of moisture"

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See also: retentive (Dictionary)