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Adjective: schlumpy (schlumpier,schlumpiest)  shlúm-pee
Usage: N. Amer, informal
  1. Negligent of neatness especially in dress and person; habitually dirty and unkempt
    "filled the door with her schlumpy bulk";
    - frowsy, frowzy, slovenly, shlumpy [N. Amer, informal], slobbish [Brit], slobby [informal]

Derived forms: schlumpier, schlumpiest

See also: untidy