Covert (adjective): Characterized by secrecy or concealment; not openly acknowledged or displayed. Covert actions, plans, or operations are conducted in a hidden or surreptitious manner, often to avoid detection or scrutiny.
The term implies a deliberate effort to keep something private or under wraps, whether to maintain a strategic advantage, protect sensitive information, or engage in activities that would be unacceptable if publicly known.
It involves a degree of planning and execution aimed at obscuring the true nature or purpose of the endeavor.
OPS SLY
LAIR
COVER
SECRET SCREEN HIDDEN
FURTIVE
ULTERIOR
CONCEALED DISGUISED
CONCEALMENT
SURREPTITIOUS