Harmonious, a.
Etymology: [Cf. F. harmonieux. See Harmony.]
1. Adapted to each other; having parts proportioned to each other; symmetrical. God hath made the intellectual world harmonious and beautiful without us. Locke.
2. Acting together to a common end; agreeing in action or feeling; living in peace and friendship; as, an harmonious family.
3. Vocally or musically concordant; agreeably consonant; symphonious. -- Har*mo"ni*ous*ly, adv. -- Har*mo"ni*ous*ness, n.
Shades of meaning
Fernald lists harmonious only as an antonym, under incongruous.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given