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adjective
not accessible to view
"concealed (or hidden) damage"
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adjective
designed to elude detection
"a hidden room or place of concealment such as a priest hole"
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adjective
difficult to find
"hidden valleys"
"a hidden cave"
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secret
hidden from general view or use
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concealed
hidden on any grounds for any motive
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occult
hidden and difficult to see
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secluded
hidden from general view or use
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privy
hidden from general view or use