hidden, concealed, obscured, out of sight, unseen, covert, clandestine,, veiled, shrouded, masked, undercover, in hiding, in the dark, invisible, unnoticed, undetected, unobserved, stealthy, lurking,... [more]
hidden, concealed, obscured, out of sight, unseen, covert, clandestine,, veiled, shrouded, masked, undercover, in hiding, in the dark, invisible, unnoticed, undetected, unobserved, stealthy, lurking,... [more]