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Webster 1913 Edition

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Adj.

[Cf.

diplomatique

Pertaining to diplomacy; relating to the foreign ministers at a court, who are called the diplomatic body.

Characterized by tact and shrewdness; dexterous; artful;

as,

diplomatic

management

Pertaining to diplomatics; paleographic.

Astle.

diplomatical ‎(comparative more diplomatical, superlative most diplomatical)

Obsolete form of diplomatic.
- 1801, Edited by James D. Richardson, A Compilation of the Messages and Papers of the Presidents:
  Whenever the channels of diplomatical communication between the United States and France shall be opened, I shall demand satisfaction for the insult and reparation for the injury.