Learner's definition of NAMELESS
1 : having a name that is not known or told
the nameless [=anonymous, unknown] author of the editorial
She left the hotel with a nameless man in a black jacket.
a nameless informant
The source for my story prefers to remain nameless.
A top government official, who shall remain nameless, has expressed concern about the decision.
3 : not marked with a name 4 a : not able to be identified by name b : too bad to talk about