diplomatic language

There is no diplomatic language, though various languages have from time to time been more commonly used.

They veil the meaning of this word in the elegance, the subtlety, the resources, of diplomatic language.

That, of course, was not exactly striped-pants diplomatic language.

The reply of the grand council to Peter Stuyvesant was couched in the coolest and most diplomatic language.

This we refused to do, and our relations with him became what is called in diplomatic language "extremement tendues."