n.

1. 虚弱；软弱；薄弱[U]
   Weakness compelled him to retire early.

   他因身体虚弱而较早退休。

2. 弱点；缺点[C]
   We all have our little weaknesses.

   我们大家都有自己的小毛病。

   Angling for compliments is one of his weaknesses.

   爱听恭维话是他的毛病之一。

3. 嗜好；偏爱[C][S1][（+for）]
   His weakness for cigarettes is detrimental to his health.

   他抽烟的嗜好对他的身体有害。

n.

1. the state of being weak.
2. a disadvantage or fault.
3. a person or thing that one is unable to resist.
   ▸ (weakness for) a self-indulgent liking for.