harmonious \harmo"nious\ haumrm=o"ni^u^s, a. cf.
   f. harmonieux. see harmony.
   1. adapted to each other; having parts proportioned to each
      other; symmetrical.
      1913 webster

            god hath made the intellectual world harmonious and
            beautiful without us.                 --locke.
      1913 webster

   2. acting together to a common end; agreeing in action or
      feeling; living in peace and friendship; as, an harmonious
      family.
      1913 webster

   3. vocally or musically concordant; agreeably consonant;
      symphonious. -- harmo"niously, adv. --
      harmo"niousness, n.
      1913 webster
see also:
harmony harmo"niously harmo"niousness 

harmoniousness
     n 1: the property of sounding harmonious syn: consonance
     2: compatibility in opinion and action syn: harmony
see also:
consonance harmony