Wiktionary
untrackable
a. Not trackable; incapable of being tracked.
Usage examples of "untrackable".
Much of the comm link from each telescope and instrument to these underground warrens traversed buried, military-use-onlywhich was to say, supposedly untrackable and unhackableoptical fibers.
Much of the comm link from each telescope and instrument to these underground warrens traversed buried, military-use-only—which was to say, supposedly untrackable and unhackable—optical fibers.