Mediocre (adjective)

1. Of only average quality; not very good.
2. Ordinary and not very good.

Origin:

Late 16th century (in the sense "halfway between good and bad"): from latin mediocris "of middle height, mediocre", from medius "middle" + -ocris (from greek hēkē "power"), influenced by french médiocre.

Examples:

1. The food at the restaurant was mediocre at best.
2. The performance was mediocre and forgettable.
3. He is a mediocre student.
4. I was expecting a great performance, but it was only mediocre.
5. The movie was mediocre, it lacked the excitement and drama of the book.