Things that are harmonious go together nicely, like notes in music or people that work well as a team.

The idea of things being harmonious comes from music — when certain notes sound good together, they are harmonious. But this concept applies to many other things and people, too. You could say pieces of art that look good next to each other are harmonious. A basketball team that shares the ball and gets along well is harmonious. Anytime people get along, they're being harmonious. In a totally harmonious society, there would be no war or hate.

Definitions of harmonious
  1. adjective
    exhibiting equivalence or correspondence among constituents of an entity or between different entities
    synonyms: proportionate, symmetrical
    being in a state of proper equilibrium
  2. adjective
    existing together in harmony
    harmonious family relationships”
    able to exist and perform in harmonious or agreeable combination
  3. adjective
    suitable and fitting
    “the tailored clothes were harmonious with her military bearing”
    congruent, congruous
    corresponding in character or kind
  4. adjective
    musically pleasing
    able to exist and perform in harmonious or agreeable combination
    consonant, harmonic, harmonical, harmonised, harmonized
    involving or characterized by harmony
    harmonic, sympathetic
    relating to vibrations that occur as a result of vibrations in a nearby body
    on-key, true
    in tune; accurate in pitch
    free from discordant qualities
    symphonic, symphonious
    harmonious in sound
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    inharmonious, unharmonious
    not in harmony
    not compatible
    discordant, disharmonious, dissonant, inharmonic
    lacking in harmony
    false, off-key, sour
    inaccurate in pitch
    dissonant, unresolved
    characterized by musical dissonance; harmonically unresolved
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