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crypto-
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secretionary
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confidentiality
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secretoinhibitory
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concealing
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tip one's hand
clandescent
metaphysic
spill the beans
uncompromising
secrecy
silence
secretiveness
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make known
top secret
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shadow history
dictate
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underplot
underhanded
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back to basics
nonsecretion
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postulate
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arcane
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sensitive
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under the covers
secretary
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hiddenly
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on the down-low
secretogen
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secretolytically
under the table
indwelling
secret
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something nasty in the woodshed