Definition of "shyly"

The moon went slowly down in chastened loveliness; she departed like some sweet bride into her chamber, and long veil-like shadows crept up the sky through which the stars peeped shyly out.

1886 October – 1887 January, H[enry] Rider Haggard, She: A History of Adventure, London: Longmans, Green, and Co., published 1887