Secret

'Secret'

Examples:
the combination to the safe was a secret
he tried to keep his drinking a secret

'Secret'

Examples:
the secret of Cajun cooking

'Secret'

Examples:
how it got out is a mystery
it remains one of nature's secrets

'Secret'

Examples:
a secret formula
secret ingredients
secret talks

'Secret'

Examples:
clandestine intelligence operations
cloak-and-dagger activities behind enemy lines
hole-and-corner intrigue
secret missions
a secret agent
secret sales of arms
surreptitious mobilization of troops
an undercover investigation
underground resistance

'Secret'

Examples:
a secret marriage
a secret bride

'Secret'

Examples:
their secret signal was a wink
secret messages

'Secret'

Examples:
secret (or private) thoughts

'Secret'

Examples:
a hidden room or place of concealment such as a priest hole
a secret passage
the secret compartment in the desk

'Secret'

Examples:
a privy place to rest and think
a secluded romantic spot
a secret garden

'Secret'

Examples:
this arrangement must be kept confidential
their secret communications

'Secret'

Examples:
a secret alcoholic

'Secret'

Examples:
mysterious symbols
the mystical style of Blake
occult lore
the secret learning of the ancients

'Secret'