The answer is:
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Secret (a.) — Hidden; concealed; as, secret treasure; secret plans; a secret vow.
Secret (a.) — Withdraw from general intercourse or notice; in retirement or secrecy; secluded.
Secret (a.) — Faithful to a secret; not inclined to divulge or betray confidence; secretive.
Secret (a.) — Separate; distinct.
Secret (a.) — Something studiously concealed; a thing kept from general knowledge; what is not revealed, or not to be revealed.