Undiscernimus: [un•dis•cern•i•mus]: adjective:
unseen by all except to those romantically involved.
from Latin indespectus, “invisible” and commenticius, “imaginary”:
Example: Though Sara often talked about her boyfriend Wes, many deemed him to be undiscernimus because he was never seen with her.
Undiscernimus is not to be confused with Discernimus which means one who is seen by all; visible.
from the Lexicon of Blatherskites