perdu

buried camouflaged covered planted veiled

cached enshrouded guarded masked obscure obscured screened secreted shrouded stashed

covered up covert holed up hush-hush hushed up incog incognito inconspicuous privy put in the hole recondite tucked away ulterior under wraps unseen

bare clear disclosed exposed obvious open plain revealed shown told uncovered

imperceptible microscopic unseen

inconspicuous unseeable

concealed covert deceptive disguised ethereal gaseous ghostly ideal impalpable imponderable inappreciable indiscernible infinitesimal insensible intangible masked not in sight obliterated obscured occult out of sight screened supernatural ulterior unapparent undisclosed ungraspable unnoticeable unobservable unperceivable unreal unviewable vaporous veiled wraithlike

detectable obvious seen visible