me·di·oc·ri·ty

/ˌmiːdiˈɑːkrəti/ noun, pl -ties

1 [noncount] : the quality of something that is not very good : the quality or state of being mediocre

We were disappointed by the mediocrity of the wine.

2 [count] : a person who does not have the special ability to do something well

He thought that he was a brilliant artist himself and that all his fellow painters were just mediocrities.