Definition of "guiltily"

Guiltily, from time to time, she took swift inquiring looks at Mina, who was dressed more carefully, and had fresh plaited her hair.

1907, Barbara Baynton, edited by Sally Krimmer and Alan Lawson, Human Toll (Portable Australian Authors: Barbara Baynton), St Lucia: University of Queensland Press, published 1980, page 262

He was guiltily aware now that he had kept Podson in the dark about the state of his finances to secure that extra fortnight's painting.

1938, Norman Lindsay, Age of Consent, 1st Australian edition, Sydney, N.S.W.: Ure Smith, published 1962, page 156