mannerlyEnglishOxford American Thesaurusmannerly adjective dated he woke them up in as mannerly a way as he knew how: polite, courteous, well mannered, well behaved, civil, gentlemanly, ladylike, genteel, decorous, respectful, well bred, refined, polished, civilized, cultivated, gracious, chivalrous, urbane, well brought up. ▷antonyms rude.