Wiktionary
a. Not missed; of which nobody regrets the absence.
Usage examples of "unmissed".
If Pointed Shoes had been something different than he was, someone too important to vanish unmissed and unreported, someone whose tailored suit was not frayed, whose shoe heels were not worn, then the system would have answered all these questions long ago.
Thou canst easily and unmissed leave home: less than half an hour will suffice for thine absence.
Obscure and unmissed courtiers late deceased, Who have in name been bidden to the feast By blundering scribes.
She sometimes wondered how Jim could talk so much about her work, but before she could answer the question, her mind drifted back to other days, to a garden and flowers, and Jim stole away unmissed, and left her with folded hands and wide, staring eyes, gazing into the distance.