Covert (adj): Secret or hidden. (छिपा हुआ, गुप्त)
Synonyms: Surreptitious, Clandestine, Undercover, Furtive
Antonyms: Obvious, Visible, Exposed, Manifest
Example: The agents went to great lengths to make sure that their enemy country could not discover their covert plans.
It could start with covert operations which can be ongoing, to trans-border raids several notches higher than the surgical strikes and targeting Pakistan Army resources as against terrorist infrastructure, and surgical air strikes against terrorist bases inside Pakistan.