mediocrity

Short definition from Wiktionary

Noun

1. 1
   The condition of being mediocre; having only an average degree of quality, skills etc.; no better than standard.
2. 2
   A person with mediocre abilities or achievements.
3. 3
   The quality of being intermediate between two extremes; a mean.
4. 4
   A middle course of action; moderation, balance.