The Collaborative International Dictionary
Sillily
Sillily \Sil"li*ly\, adv. [From Silly.]
In a silly manner; foolishly.
--Dryden.
Wiktionary
sillily
adv. (context dated English) In a silly manner; foolishly.
Usage examples of "sillily".
He leaned against the wall grinning sillily while he put his clothes on, noticing for the first time that it was Pfc Hanson again with Fatso this time, Pfc Hanson alone, and realising dimly that it must therefore have been Pfc Hanson who had gasped.