a.

1. 祕密的，機密的
   He kept his illness secret from his parents.

   他沒有告訴他父母他生病的事。

2. 私下的，暗地裡的[B]
   The political prisoner was executed after a secret trial.

   那名政治犯在受祕密審判後被處決了。

3. 隱蔽的，暗藏的
   He left through a secret door.

   他經由一暗門離開。

4. 神祕的，奧祕的
5. 偏僻的；人跡罕至的
6. 嘴緊的，能保守祕密的[F][（+about）]
   He is secret about his past.

   他對自己早年的經歷一向嘴緊。

n.[C]

1. 祕密，機密；內情
   I'll tell you a secret that I've never told a living soul.

   我要告訴你一個我從未告訴過任何人的祕密。

2. 神祕，奧祕[P]
3. 祕訣，訣竅；祕方[the S][（+of）]
   One of the secrets of good health is regular exercise.

   身體健康的訣竅之一是定時運動。

4. （人體）陰部[P]

adj.

n.

1. something kept or meant to be kept secret.
   ▸something not properly understood; a mystery:

   the secrets of the universe.
2. a way of achieving something, especially one that is not commonly known:
   the secret of a happy marriage is compromise.
3. a prayer said quietly by the priest after the offertory in a Roman Catholic Mass.