harmonious

adjective

1 harmonious music:

tuneful, melodious, melodic, sweet-sounding, pleasant-sounding, sweet-toned, mellifluous, dulcet, lyrical;

euphonious, euphonic, harmonic, harmonizing, polyphonic, consonant;

informal easy on the ear;

rare symphonious, canorous, mellifluent.

▷antonyms discordant.

2 a harmonious relationship between business and customer:

friendly, amicable, cordial, amiable, agreeable, congenial, easy, peaceful, peaceable, conflict-free, cooperative, good-natured;

fraternal, compatible, sympathetic, united, attuned, in harmony, in rapport, in tune, in accord, of one mind, seeing eye to eye, free from disagreement.

▷antonyms hostile.

3 the decor is a harmonious blend of traditional and modern:

congruous, coordinated, matching, balanced, proportional, in proportion, compatible, well matched, well proportioned, well balanced.

▷antonyms incongruous.