secret

(noun)

something that should remain hidden from others (especially information that is not to be passed on)

All clip examples

• You're always happy. What's the secret? (Love Affair)
• Would you like to know the secret of success? (The Last Time I Saw Paris)
• Well, Miss Starlin, does my secret have interest for you, yes? (The Wasp Woman)
• The private laboratory, the secret experiments, (The Wasp Woman)
• My friend, we cannot keep this a secret any longer. (Plan 9 from Outer Space)
• based only on the secret testimony... (Plan 9 from Outer Space)