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Adjective: forgetful  fu(r)'get-ful or for'get-ful
  1. (of memory) deficient in retentiveness or range
    "a forgetful memory";
    - unretentive, short
     
  2. Not mindful or attentive
    "while thus forgetful of his steps he stumbled";
    - unmindful, mindless
     
  3. Failing to keep in mind
    "forgetful of her responsibilities";
    - oblivious

See also: amnesiac, amnesic, heedfulness, inattentive, mindfulness, unattentive [rare]

Encyclopedia: Forgetful