fee·ble
[fee-buh‘l]
adjective, -bler, -blest.
1.physically weak, as from age or sickness; frail.
2.weak intellectually or morally: a feeble mind.
3.lacking in volume, loudness, brightness, distinctness, etc.: a feeble voice; feeble light.
4.lacking in force, strength, or effectiveness: feeble resistance; feeble arguments.