superdiplomat

noun

su·​per·​dip·​lo·​mat ˌsü-pər-ˈdi-plə-ˌmat 

plural superdiplomats

: a very powerful and effective diplomat

… I want at the United Nations an ambassador who can be a real coalition builder, a superdiplomat who can more often than not persuade the United Nations' member states to act in support of U.S. interests.

—Thomas L. Friedman

Word History

First Known Use

1916, in the meaning defined above