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Secret, secretive and in secret - synonyms or related words

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

formal

secret and often illegal

in secret

without anyone else knowing

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 armed forces

secret

adjective

not known about by many people

nanodegree

a course of study which is much shorter than a university course and focuses on the skills you need for a job, especially computer-related skills

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Open Dictionary

hypocaust

an ancient Roman system of underfloor heating, used to heat houses with hot air; from the Latin 'hypocaustum'

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