十じゅう人にん並なみ

noun which may take the genitive case particle 'no', na-adjective, noun

average; ordinary; run-of-the-mill

Describes ability, appearance, or quality as being about the same as ten random people—neither outstanding nor poor. Often used modestly or to downplay something.

• 彼かれの英えい語ご力りょくは十じゅう人にん並なみだ。

  His English ability is about average.

• 十じゅう人にん並なみの容よう姿しだが、性せい格かくはとてもいい。

  She has ordinary looks, but her personality is really nice.