Macmillan Dictionary

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Secret, secretive and in secret

secret

adjective

deliberately not told to other people, or kept hidden from other people

secretive

adjective

deliberately not telling people things

surreptitious

adjective

done or made secretly, so that others will not notice

clandestine

adjective

secret and often illegal

in strict confidence

kept secret by someone and not told to anyone else

underground

adverb

in or to a secret place away from the police or other authorities

mysterious

adjective

keeping things secret, especially in a way that makes other people want to discover what they are

confidential

adjective

confidential documents or information must be kept secret

shadowy

adjective

mysterious and secret, or not understood

classified

adjective

classified information is officially secret and allowed to be known by only a few people connected with the government or military

charticle

a news article that consists of a chart … and only has a small amount of text

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proton

the part of the nucleus of an atom that has a positive electrical charge

Open Dictionary

never event

an event that should never occur in a healthcare setting …

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