covert
co-vert
noun
A thicket or dense undergrowth providing shelter for game animals.
"The deer vanished into the covert."
adjective
Not openly acknowledged or displayed; secret or hidden from view.
"They launched a covert operation."
Thesaurus
Synonyms: under wraps, subterranean, disguised, masked, underground, subterraneous, undisclosed, clandestine, cloak-and-dagger, hush-hush, undercover, under-the-table