offhand

But Lou was jolly and frank and offhanded, while Ruth was painfully shy and reserved, and that was the secret of the whole matter.

Yes; I think I knew even in his offhanded reference to comments on those that he was using Marxian terminology.

"I suppose they have a baby by now," she said in an offhanded tone.

Poor little Jane adds, "These words told me offhanded and without preparation agitated my soul within me."