The phrase "are civil" means to behave in a courteous, polite or respectful manner. There are several synonyms one can use instead of "are civil." For instance, a person can say "are well-mannered," which carries a similar connotation. Alternatively, one can use "are courteous," or "are considerate," which imply thoughtfulness towards others. Another synonym for "are civil" is "are polite," which suggests respect for social conventions. Additionally, one can use "are cordial," which denotes friendliness and warmth. Overall, there are various words that one can use instead of "are civil", but the underlying message remains the same: a person exhibiting desirable social behaviors.