invisible
Unable to be seen; out of sight; not visible.
Not appearing on the surface.
(Internet) Apparently, but not actually, offline.
(psychology) That is ignored by a person.
To make invisible, to invisiblize.
(obsolete) An invisible person or thing; specifically, God, the Supreme Being.
(obsolete) A Rosicrucian; so called because avoiding declaration of his craft.
(obsolete) One of those (as in the 16th century) who denied the visibility of the church.