My father was unable to talk about the war, it was so frightful.

我父亲没法谈论那场战争，那太可怕了。

He got himself into a frightful muddle.

他把自己卷进了一个不可收拾的乱摊子。

What frightful gossips people are, even one's best friends.

人们最爱散布流言蜚语，哪怕是自己最好的朋友也不例外。