Invisible

From Old French invisible, from Latin invisibilis

Full definition of invisible

John MiltonTo us invisible, or dimly seen
In these thy lowest works.
1898, Winston Churchill, The Celebrity Chapter 4, The Celebrity, by arts unknown, induced Mrs. Judge Short and two other ladies to call at Mohair on an afternoon when Mr. Cooke was trying a trotter on the track....Their example was followed by others at a time when the master of Mohair was superintending in person the docking of some two-year-olds, and equally invisible.
2013, William E. Conner, An Acoustic Arms Race, Earless ghost swift moths become â€œinvisibleâ€ to echolocating bats by forming mating clusters close (less than half a meter) above vegetation and effectively blending into the clutter of echoes that the bat receives from the leaves and stems around them.
2013, Jayne Smith, Guide to Basic Garment Assembly for the Fashion Industry (page 60)The teeth on an invisible zip are different from those on a conventional zip, as they are turned onto the inside so that they do not show, giving the impression of being concealed in the seam, as seen below.

Not appearing on the surface.
(Internet) Apparently, but not actually, offline.
I went invisible so that my ex-girlfriend wouldn't send me instant messages.
(psychology) That is ignored by a person.