The Collaborative International Dictionary of English v.0.48:
Shyly \Shy"ly\, adv. In a shy or timid manner; not familiarly; with reserve. [Written also shily.] [1913 Webster]WordNet (r) 3.0 (2006):
shyly adv 1: in a shy or timid or bashful manner; "he smiled shyly" [syn: shyly, timidly, bashfully]