feeble

/ˈfibəl/
adjective
  1. Very weak, lacking physical strength or energy.
    • The old dog grew feeble and could no longer climb the stairs.
    • After the long illness, the patient felt too feeble to walk.
    • His feeble arms could barely lift the grocery bag.
  2. Lacking strength, effectiveness, or power; weak in force or effect.
    • She gave a feeble excuse for being late, which no one believed.
    • The light from the candle was too feeble to read by.
    • The team made a feeble attempt to defend their goal.