The Great Gatsby, jauntiness

Hello! I'd like to know the meaning of "jauntiness" and "jauntily" in all these excerpts from The Great Gatsby by F. Scott Fitzgerald. These passages are all about Jordan Baker:

1 It was dark now and as we dipped under a little bridge I put my arm around Jordan’s golden shoulder and drew her toward me and asked her to dinner. Suddenly I wasn’t thinking of Daisy and Gatsby any more but of this clean, hard, limited person, who dealt in universal scepticism and who leaned back jauntily just within the circle of my arm.

2 She got up slowly, raising her eyebrows at me in astonishment, and followed the butler toward the house. I noticed that she wore her evening dress, all her dresses, like sports clothes—there was a jauntiness about her movements as if she had first learned to walk upon golf courses on clean, crisp mornings.

3 She was dressed to play golf and I remember thinking she looked like a good illustration, her chin raised a little jauntily, her hair the color of an autumn leaf, her face the same brown tint as the fingerless glove on her knee.

Thank you.