Frivolous talk is hurtful talk; besides, it is unbecoming to be chatterbox.

轻浮的谈话是有害的；而且，做一个喋喋不休的人实在很不体面。

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"There is something a little stately in him to be sure," replied her aunt, "but it is confined to his air, and is not unbecoming."

舅母说：“他的确有点儿高高在上的样子，不过只是风度上稍微有这么一点儿罢了，并不叫人讨厌。”

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The noise and dirt of the cars whizzing past might be a little unbecoming, but the Colosseum is not a building to be hidden away in a quiet corner.

BBC: The classic wonders of Rome