1. (a.) Adapted to each other; vocally or musically concordant; as, harmonious voices\.

2. (a.) Acting together to a common end; agreeing in action or feeling; living in peace and friendship; as, an harmonious family.

3. (a.) Vocally or musically concordant; agreeably consonant; symphonious.

accompanying accordant according affable affirmative agreeable agreeing akin amiable amicable anal answerable arranged associate associated assonant assonantal at one at one with attuned balanced blended blending blissful bourgeois brotherly businesslike canorous cheerful chiming chromatic coacting coactive coadjutant coadjuvant coadunate coefficient coequal coexistent coexisting coherent coincident coinciding cold collaborative collective collectivist collectivistic collusive colorific coloring combined combining commensal commensurate common communal communalist communalistic communist communistic communitarian compatible complaisant complementary compulsive concerted concinnate concinnous concomitant concordant concurrent concurring conformable conformist congenial congruent congruous conjoint conniving consentaneous consentient consilient consistent consonant conspiratorial contrapuntal conventional cool cooperant cooperating cooperative coordinate cordial correspondent corresponding coworking desirable dichromatic dulcet ecumenic empathetic empathic en rapport enjoyable equal equilateral equivalent euphonic euphonical euphonious eurythmic even fair fair and pleasant favorable felicific felicitous fellow fine finished flowing fluent formal formalistic fraternal frictionless friendlike friendly genial glowing good goodly gracious grateful gratifying habitual harmonic harmonized harmonizing heart-warming homophonic honeyed in accord in agreement in chorus in concert in concord in hand in keeping in line in rapport in step in sync in synchronization in tune in unison inaccordance inharmony joint kind kosher likable like-minded many-colored matching measured medley meeting mellifluous mellisonant mellow melodious methodical monochromatic monochrome monochromic monodic monophonic motley musical mutual neighborlike neighborly nice noncompetitive normal of a piece of like mind of one accord of one mind on all fours ordered orderly orthodox parasitic parti-colored peaceable peaceful pedantic pigmentary plastic pleasant pleasing pleasurable pleasure-giving pleasureful polychromatic polyphonic positive precisianistic prismatic proportionate proportioned rainbow reciprocal reconcilable regular rewarding routine saprophytic satisfying self-consistent silvery simpatico sisterly smooth smooth-sounding sociable sonorous spectral square steady straight stuffy sweet symbiotic symmetric symmetrical sympathetic sympathique symphonic symphonious synchronized synchronous synergetic synergic synergistic systematic tinctorial tingent together toning traditionalist