covertly
/ˈkəʊvəːtli
/ /kəʊˈvəːtli /adverb
Without being openly acknowledged or displayed; secretly: a transcript of a covertly taped meeting...
- They are just a minor part of an immense criminal operation that is covertly linked to terrorist groups.
- Her father took a camera with him and covertly filmed what he saw.
- Compromised websites can covertly install programs.