cannot be seen as there is something concealing/hiding/blocking it.
help sir
Hidden
hidden, invisible, unseen
snack, nosh, nosh-up
hidden
hide
Hidden, covered, censored, blocked
"hidden" "sequestered" "out of sight" "put away"
Concealed
covert unseen hidden masked disguised
covert, hidden, unseen
I assume you mean concealed. Not without a permit.