enfeebling

/ɛnˈfibəlɪŋ/
adjective
  1. Causing someone or something to become weak or feeble.
    • The constant stress was enfeebling her ability to concentrate.
    • Enfeebling droughts have ruined many farmers in the region.
    • The long illness had an enfeebling effect on his muscles.
noun
  1. The act or process of making someone or something weak.
    • Historians studied the enfeebling of the empire after the war.
    • The enfeebling of the old bridge was caused by years of neglect.
    • The medicine slowed the enfeebling of his joints due to arthritis.