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Hidden (The 4400 episode)
WordNet
adjective
(1) Difficult to find
"Hidden valleys"
"A hidden cave"
"An obscure retreat"
(2) Designed to elude detection
"A hidden room or place of concealment such as a priest hole"
"A secret passage"
"The secret compartment in the desk"
(3) Not accessible to view
"Concealed (or hidden) damage"
"In stormy weather the stars are out of sight"