noun
diplomatist
dih-PLOH-muh-tist/dɪˈpləʊmətɪst/
A person skilled in diplomacy or international negotiation.
The diplomatist helps both countries find common ground during negotiations.

Etymology
The base refers to an official document, while the ending identifies a practitioner. The connection to negotiation runs through diplomacy’s work of conducting formal relations between nations and drafting treaties.
In context
a supple diplomatist to all above. He held high debate with neighboring abbots and lords, with bishops, with papal legates, and even on occasion with the King’s majesty himself.
More examples
- An experienced diplomatist knows when to offer a compromise.
- Both governments send their best diplomatists to the peace talks.
- She handles the tense discussion with the patience of a diplomatist.
Forms
diplomatist · diplomatists
diplomacy noun — The practice of managing relations between countries.
diplomatic adjective — Skilled at managing sensitive discussions and negotiations.
Similar words
- diplomat
- Usually identifies an official representative rather than emphasizing negotiating skill.
- negotiator
- Focuses on reaching agreements, not necessarily between nations.