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Adjective: sapless  sap-lus
  1. Lacking bodily or muscular strength or vitality
    "her body looked sapless";
    - decrepit, debile, feeble, infirm, rickety, weak, weakly
  2. Destitute of sap and other vital juices; dry
    "the rats and roaches scurrying along the sapless planks"

See also: frail, juiceless