Surreptitiously (synonyms (sneaky, stealthy, creative), antynoms (openly,…
Dictionary: acting in a stealthy way
My Definition: acting sneaky
She acted very surreptitiously when she tried to scare her brother.
The way the robber robbed the jewelry store was very surreptitiously
In the story it says on page 16 "Some of the Jewish police surreptitiously went to fill a few jugs"