What do you mean, plain?

It's wrong to say it lightly, and it's wrong to say it strangely.

Tan T ǔ Boven's Talk: Levels, Features and Styles of Speech in Daily Life. Based on a certain language, the reflection of ideological and cultural level, educational interest and speech act is an important basis for people to form an evaluation of a person. Extraordinary: unusual; Outstanding; Extraordinary words, that is, the words spoken have a certain level and gain higher recognition than others. In modern and ancient times, it is often used to praise the wonderful speeches of scholars and commentators.

Part of speech: commendatory term