As if it were not very painful to me to see you an idle frivolous creature.
That was an unpropitious hour for coming home: it was too early to gain the moral support under ennui of dressing his person for dinner, and too late to undress his mind of the day’s frivolous ceremony and affairs, so as to be prepared for a good plunge into the serious business of study.
He pushed aside his plate, poured out his glass of ale and drew his chair a little forward, profiting by the occasion to look at the inner side of his legs, which he stroked approvingly—Mr. Trumbull having all those less frivolous airs and gestures which distinguish the predominant races of the north.
There are no more uses of "frivolous" in the book.