She is a plain middle-aged woman who has had to work hard for everything.

"Think what it must be like for a plain young woman!"

To his surprise, he falls in love with this plain young woman.

She was a plain young woman, thick and dark with a worn face.

He hadn't been in love with her, of course, but though a plain woman she was quite a pleasant one.

She might in other circumstances have been quite a plain woman.

"Was she also a plain woman, and much older than the Colonel?"

She was a short woman, rather plain and chubby, just coming into middle age.

I looked at the clerk, a plain woman some years my senior.

She was a plain young woman wearing a white serving dress.