amiableness

These days of confinement would have been, but for her private perplexities, remarkably comfortable, as such seclusion exactly suited her brother, whose feelings must always be of great importance to his companions; and he had, besides, so thoroughly cleared off his ill-humour at Randalls, that his amiableness never failed him during the rest of his stay at Hartfield.

Distinguished by his vast learning, his admirable clearness of mind, the diversity of his acquirements, the calmness and dignity of his character, and the amiableness of his manners, Gassendi was alike one of the brightest ornaments of his age and of human nature.

The quality of being amiable; amiableness; sweetness of disposition.

His character has always been greatly extolled for the judgment which he exhibited in very trying periods, and for the amiableness of his disposition. 

He was a man of blameless morals, deep erudition, and sincere piety; and he was greatly beloved for the amiableness of his manners.