weakness weakness /ˈwiːknəs/

noun

1. () A flaw or weak point  ( failing , weakness )
   a flaw or weak point
    He was quick to point out his wife's failings
   he was quick to point out his wife's failings
   
2. () The property of lacking physical or mental strength; liability to failure under pressure or stress or strain  ( weakness )
   the property of lacking physical or mental strength; liability to failure under pressure or stress or strain
    His weakness increased as he became older
   his weakness increased as he became older
    The weakness of the span was overlooked until it collapsed
   the weakness of the span was overlooked until it collapsed
   
3. () Powerlessness revealed by an inability to act  ( impuissance , helplessness , weakness )
   powerlessness revealed by an inability to act
    In spite of their weakness the group remains active
   in spite of their weakness the group remains active
   
4. A penchant for something even though it might not be good for you  ( weakness )
   a penchant for something even though it might not be good for you
    He has a weakness for chocolate
   he has a weakness for chocolate
   
5. The condition of being financially weak  ( weakness )
   the condition of being financially weak
    The weakness of the dollar against the yen
   the weakness of the dollar against the yen