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.

Uses:

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.