tactful

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.

As adjectives the difference between tactful and gracious

is that tactful is possessing tact; able to deal with people in a sensitive manner while gracious is kind and warmly courteous.

As a interjection gracious is

expression of surprise, contempt, outrage, disgust, boredom, frustration.

Tactful is a derived term of tact.

As a adjective tactful

is possessing tact; able to deal with people in a sensitive manner.

As a noun tact is

the sense of touch; feeling.