diplomatic vs diplomatical

diplomatic and diplomatical both are adjectives.

Word	Noun	Adjective	Verb	Adverb
diplomatic	No	Yes	No	No
diplomatical	No	Yes	No	No

As adjectives, diplomatic and diplomatical are synonyms defined as:

diplomatic and diplomatical: using or marked by tact in dealing with sensitive matters or people

diplomatic (adjective)	diplomatical (adjective)
using or marked by tact in dealing with sensitive matters or people	using or marked by tact in dealing with sensitive matters or people
relating to or characteristic of diplomacy