weakness

noun

1.
a flaw or weak point
failing
Derived from:
weak
2.
powerlessness revealed by an inability to act
helplessness impuissance
Derived from:
weak
3.
the property of lacking physical or mental strength; liability to failure under pressure or stress or strain
Antonym:
strength
Derived from:
weak
4.
the condition of being financially weak
Antonym:
strength
Derived from:
weak
5.
a penchant for something even though it might not be good for you