used when you want to say that someone has done something wrong but without mentioning their name, especially to criticize them in a friendly way:
A certain person, who shall remain nameless, forgot to lock the front door.
2 [only before noun]
a nameless person is someone whose name is not known:
the work of some nameless 13th century writer
3 [only before noun]
a nameless thing does not have a name:
He lay still in his nameless grave.
4 [only before noun] literary
nameless emotions are very strong and difficult to describe in words:
He managed to calm her nameless fears.
5 [only before noun] literary
too terrible to name or describe: