Definition of "casually"
casually
adverb
comparative more casually, superlative most casually
Quotations
A small minority, mainly strangers, would look long at her in casually passing by, and grow momentarily fascinated by her freshness, and wonder if they would ever see her again: but to almost everybody she was a fine and picturesque country girl, and no more.
1891, Thomas Hardy, Tess of the d'Urbervilles, volume 1, London: James R. Osgood, McIlvaine and Co., page 21
"A fine man, that Dunwody, yonder," commented the young captain, as they parted, and as he turned to his prisoner. "We'll see him on in Washington some day. […] A strong man—a strong one; and a heedless." ¶ "Of what party is he?" she inquired, as though casually.
1910, Emerson Hough, chapter I, in The Purchase Price: Or The Cause of Compromise, Indianapolis, Ind.: The Bobbs-Merrill Company
The detective kept them in view. He made his way casually along the inside of the shelter until he reached an open scuttle close to where the two men were standing talking. Eavesdropping was not a thing Larard would have practised from choice, but there were times when, in the public interest, he had to do it, and this was one of them.
1928, Lawrence R. Bourne, chapter 7, in Well Tackled!