Definition of "fearlessly"

The swallows, which had been tempted here in great numbers on account of the quantity of insects to be found in proximity to the wood, and had established themselves in the barn and under the eaves, were gambolling, circling, and twittering fearlessly about in the sunshine.

1886, Peter Christen Asbjørnsen, translated by H.L. Brækstad, Folk and Fairy Tales, page 278