indeprensus, a, um, adj. [2. in-deprehendo],
unobserved , undiscovered (poet.): (with irremeabilis) error, Verg. A. 5, 591: vestigia, Stat. Th. 6, 565: retinacula, Prud. Hamart. 141.
in-dēprēnsus adj., undetected: error, V. ...
An Elementary Latin Dictionary