/hɑːrˈmoʊniəs/
har·mo·ni·ous
BrE /hɑːˈməʊniəs/
NAmE /hɑːrˈmoʊniəs/
(of relationships, etc.)
friendly, peaceful and without any disagreement
arranged together in a pleasing way so that each part goes well with the others
SYN pleasing
a harmonious combination of colours
(of sounds)
very pleasant when played or sung together
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har·mo·ni·ous·ly
BrE /hɑːˈməʊniəsli/
NAmE /hɑːrˈmoʊniəsli/
They worked very harmoniously together.