As adjectives the difference between tactful and undiplomatic
is that tactful is possessing tact; able to deal with people in a sensitive manner while undiplomatic is not diplomatic or tactful.
tactful
English
Adjective
(
en adjective)
Possessing tact; able to deal with people in a sensitive manner.
Antonyms
* tactless
undiplomatic
English
Adjective
(
en adjective)
not diplomatic or tactful
lacking sensitivity or the skill of dealing with others