adjective
1.
musically concordant
a harmonious morning chorus of birds
Synonyms: blending, chiming, consonant, harmonic, musical, symphonic, symphonious
Related Word: canorous, dulcet, euphonious, mellifluous, mellisonant, melodious, musical, silvery, sonorous, sweet, tuneful; chordal, contrapuntal, counterpointed, polyphonic
Idioms: in concert, in tune
Contrasted words: clashing, discordant, dissonant, grating, harsh, jangling, jarring, raucous, shrill, strident, tuneless, unmusical, untuneful; atonal
Antonyms: disharmonious, inharmonious, unharmonious
2.
having the parts agreeably related
a building with harmonious proportions
Synonyms: accordant, concordant, congruous; compare consonant 1
Related Word: agreeable, pleasing, satisfying; concinnate, symmetrical
Contrasted words: clashing, incongruous, unsymmetrical; askew, distorted, skewed
Antonyms: inharmonious, unharmonious
3.
marked by accord in sentiment or action
a harmonious effort to reach a practicable agreement
Synonyms: amicable, amical, congenial, friendly
Related Word: coactive, collaborative, cooperative; empathetic, empathic, simpatico, sympathetic; calm, irenic, pacific, peaceful
Idioms: of one accord
Contrasted words: incompatible, uncongenial, uncooperative, unfriendly, unsympathetic; belligerent, contentious, pugnacious
Antonyms: inharmonious, unharmonious