The word "noncivil" means behaving in a rude or uncivilized manner. Its antonyms include words like civil, polite, courteous, and refined. Someone who is civil is well-mannered, considerate, and polite. A polite person always shows kindness and respect towards others. Courteous refers to someone who is polite and respectful towards others. Refined refers to someone who is cultured, sophisticated, elegant, and polite. Other antonyms for noncivil include civilized, cultured, mannerly, gracious, and decent. In short, noncivil is a negative trait that is opposite to positive traits like being civil, polite, courteous, and refined.