There are big mouth people, and now I'm searching for the term that describes a person who can keep secret with them. Such people don't reveal what all they have in their minds. They are silent, deep, and master in hiding things within them.

I want a term for a neutral person. In other words, that person could be bad or good to you.

Note: this person has nothing to do with country's secrets.

  • "A reliable person", perhaps. "He is a good secret-keeper", maybe. Jan 4 '19 at 9:28
  • very general it is... @CowperKettle and obviously, I know that!
    – Maulik V
    Jan 4 '19 at 9:29
  • Discreet is a good word for this. If you can rely on someone's discretion, you know they will keep a secret or deal responsibly with sensitive information. Jan 4 '19 at 10:07

They are RETICENT, one not revealing one's thoughts or feelings readily.

  • She is extremely reticent about her personal affairs.
  • Spot on! Exact sense, exact meaning, exact context!
    – Maulik V
    Jan 7 '19 at 7:35

More idiomatic terms are tight-lipped and closemouthed. They could be considered antonyms to "big mouthed", and means the same thing as Barid's more formal answer, reticent.

  • 1
    Even closer to an antonym for “big mouthed” is “close mouthed” - they keep their mouth closed (note where the ‘ed’ is though!) Jan 4 '19 at 21:43
  • @JohnBurger Great suggestion!
    – Tashus
    Jan 7 '19 at 15:02

I would say that, at least to when it comes to keeping secrets, they are trustworthy:

: worthy of confidence : DEPENDABLE
// a trustworthy guide
// trustworthy information

In other words, it's safe to entrust your secret to them.

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