weakness

noun

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

Also useful for “weakness”:Scrabble— High-value letters — see what it scores