a person without strong character, ideas, or influence

She was once a political nonentity, but has since won a formidable reputation as a determined campaigner. 她一度在政界无足轻重，但后来因在竞选中意志坚定而赢得盛誉。

the fact that something or someone is not known about because of not having any strong character, ideas, or influence

This collection of essays is saved from nonentity by the stature of the contributors. 因作者声誉较高，这本文集才不至归于沉寂。