2 adverbs to describe how to unrecognize

Lieutenant Riley, who was in command of the listening-post for that night, left the workers to themselves, both because it was necessary for him to keep a sharp look-out in order to give warning of any attempt to rush the working party, and because officially he was not supposed to know anything of any sap to an officially unrecognized dead German General.

Mabel, Grim and I rode in the first one, with the Syrian officers up beside the driver; Jeremy, Narayan Singh and Hadad followed; and we went through the dark streets like sea-monsters splashing over shoals, unseen I thinkcertainly unrecognized.

2 adverbs to describe how to  unrecognize  - Adverbs for  unrecognize