Middling (adjective)

1. Being of moderate or average quality, size, or ability.
2. Being in the middle range or of moderate quality, size, or ability.

Origin:

From the word "middle", in the sense of being in the middle range or of moderate quality.

Examples:

1. The movie was just middling, not bad but not great either.
2. He is a middling student, neither at the top nor at the bottom of the class.
3. The company's profits were middling this year.
4. The hotel was middling, not luxurious but not dirty either.
5. The performance was middling, not outstanding but not terrible.