nonchalance

"Naturally," I said with nonchalance, though my quick temper was fired.

"Oh, yes," assented Kirkwood, with a nonchalance not entirely unassumed.

This was all said with a sort of nonchalance, which Corny did not at all like.

His nonchalance, I believe, was forced and meant to cover uneasiness.

The elder lady spoke with the nonchalance of one quite used to the process.

His father courteously tried to make amends for his nonchalance.

He shrugged and produced his snuff-box with an offensive simulation of nonchalance.

Thorpe nodded, with a nonchalance which was not wholly affected.

She was struggling for nonchalance, for poise, at this worst blow, so unexpected.

And the gentlemen—no doubt they reciprocated her nonchalance?