marked by agreement in feeling, attitude, or action: a harmonious group.
forming a pleasingly consistent whole; congruous: harmonious colors.
pleasant to the ear; tuneful; melodious.

1520–30; < Greek harmónios melodious, literally, fitting. See harmony, -ous

harmoniously, adverb
harmoniousness, noun
nonharmonious, adjective
nonharmoniously, adverb
nonharmoniousness, noun
preharmonious, adjective
preharmoniously, adverb
preharmoniousness, noun
unharmonious, adjective
unharmoniously, adverb

1. amicable, congenial; sympathetic. 2. concordant, congruent, consonant, consistent.

1, 3. discordant.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To harmonious
World English Dictionary
harmonious (hɑːˈməʊnɪəs)
1.  (esp of colours or sounds) fitting together well
2.  having agreement or consensus
3.  tuneful, consonant, or melodious

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The fourscore of guests at this cozy retreat practically form one harmonious
  and joyous family.
Ability to work independently as well as establish and maintain harmonious
  relations with other staff, faculty and students.
Of course an open, harmonious board is better than a divided one in which
  business is done away from the table.
For these birds, it's the more harmonious duos that frighten others the most.
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