mediocre

平凡な、二流の、あまり良くない、可もなく不可もない

Ex

  • I did not study when I was in college, my grades were mediocre.
  • The movie was not good, it was not bad, it was just mediocre.

Reference source

  • https://eow.alc.co.jp/search?q=mediocre
  • https://hinative.com/ja/questions/2185490