Adjective : a harmonious group. ,harmonious colors.    From Dictionary.com. 

They are worth a Sunday exploration, now and then, for they yet echo, not unharmoniously, to the time when the City of London really was.    From Wordnik.com.  [The Uncommercial Traveller] Reference

They are worth a Sunday - exploration, now and then, for they yet echo, not unharmoniously, to the time when the City of London really was London; when the.    From Wordnik.com.  [The Uncommercial Traveller] Reference

Cranmer had written a book upon the divorce in the preceding year, which, as coming from a well-known Cambridge man, had occasioned a careful ventilation of the question there; the resident masters had been divided by it into factions nearly equal in number, though unharmoniously composed.    From Wordnik.com.  [The Reign of Henry the Eighth, Volume 1 (of 3)] Reference