A harmonious relationship, agreement, or discussion is friendly and peaceful. Their harmonious relationship resulted in part from their similar goals = amicable + harmoniously har·mo·ni·ous·ly To live together harmoniously as men and women is an achievement
Something that is harmonious has parts which go well together and which are in proportion to each other. a harmonious balance of mind, body, and spirit. + harmoniously har·mo·ni·ous·ly a pure, harmoniously proportioned face. stone paths that blend harmoniously with the scenery
existing together in harmony; "harmonious family relationships" exhibiting equivalence or correspondence among constituents of an entity or between different entities musically pleasing