Definitions

1. adjective

excessively polite or courteous

“The ultracivil hostess went out of her way to make the guests feel welcome.”

2. noun

a person who is excessively polite or courteous

“The ultracivil man was known for his impeccable manners.”

3. adverb

in a very polite or courteous manner

“She handled the difficult situation ultracivilly and managed to diffuse the tension.”