Definition of "unbecoming"

A very small expensive black toque was hideously unbecoming to the yellow, toad-like face beneath it.

1934, Agatha Christie, chapter 3, in Murder on the Orient Express, London: HarperCollins, published 2017, page 25

― Lily: “Don’t stare so much. It’s unbecoming. It makes you look like a country bumpkin.”

2017 July 12, Moe! Ninja Girls, Japan: NTT Solmare, iOS, Android, scene: Season 7, Chapter 7, Part 2

“You must be able to smell it too, Chloe. That smell of . . Well, I’m not going to say what it reminds me of, that would be impolite and unbecoming of a woman of my class and distinction, but it’s a bad smell.”

2009, David Walliams, Mr Stink

By tracing the turns from U.S. to Japan to China, we can see that becoming American, the classic ethnic American narrative, itself opens to further becomings and unbecomings and rebecomings that address mobility and ethnicization […]

2007, Una Chung, Contagion of Living