Tim decided that looking nonchalant was a waste of effort.

They want to look nonchalant but in fact are quite studied.

It looked so nonchalant yet confident that she could not keep the smile from her face.

Coppers of various species were standing around trying to look nonchalant.

"How a naked man can look so nonchalant, I do not know."

The man was trying to look nonchalant, and not succeeding.

I leaned back in my chair and stretched, trying to make it look nonchalant.

She glanced again at Miles, who was trying his best to look nonchalant.

He was leaning against the wall, trying to look nonchalant.

He tried to look nonchalant, and only succeeded in looking foolish.