feeble

Concise Oxford English Dictionary © 2008 Oxford University Press:
feeble/ˈfiːbl/

▶adjective (feebler, feeblest)

• 1 lacking physical strength.

  ■ lacking strength of character.

• 2 failing to convince or impress: a feeble excuse.

– derivatives
feebleness noun,
feebly adverb.

– origin ME: from OFr. fieble, earlier fleible, from L. flebilis ‘lamentable’, from flere ‘weep’.