1. in the sense of confidential
- strictly confidential
- confidential
- classified
- top secret
- unrevealed
- restricted
- unpublished
- undisclosed
- unknown
- untold
- behind someone's back
- uncommunicated
- unofficial
- under wraps
- not to be made public
- off the record
- sub rosa
- not to be disclosed
- mum
- hush-hush
- concealed
- hidden
- disguised
- camouflaged
- invisible
- unnoticeable
- clandestine
- inconspicuous
- undercover
- covert
- shrouded
- underground
- surreptitious
- conspiratorial
- cloak-and-dagger
- stealthy
- closet
- hole-and-corner
- sly
- sneaky
- shifty
- underhand
- black
- furtive
- encoded
- cryptic
- enciphered
- coded
- abstruse
- mysterious
- arcane
- recondite
- cabbalistic
- esoteric
- private
- secluded
- undisturbed
- sheltered
- solitary
- unfrequented
- sequestered
- lonely
- remote
- out of the way
- off the beaten track
- isolated
- cut-off
- tucked away
2. in the sense of clandestine
- covert
- clandestine
- underground
- undercover
- shrouded
- hidden
- surreptitious
- conspiratorial
- cloak-and-dagger
- stealthy
- closet
- hole-and-corner
- sly
- sneaky
- shifty
- underhand
- black
- furtive
- hush-hush
3. in the sense of uncommunicative
- secretive
- uncommunicative
- reticent
- unforthcoming
- media-shy
- private
- silent
- taciturn
- quiet
- non-communicative
- close-mouthed
- tight-lipped
- clamlike
- close
- introvert
- reserved
- self-contained
- introverted
- discreet
4. in the sense of confidential matter
- confidence
- confidential matter
- skeleton in the cupboard
- private affair
- secret
- skeleton in the closet
5. in the sense of mystery
6. in the sense of recipe
Example Sentences of Secret
1. She whispered the secret to me.
2. They kept the secret hidden well.
3. His secret recipe was legendary.
4. The secret meeting lasted for hours.