Wiktionary
adv. In a toothy manner.
Usage examples of "toothily".
From the preserved caimans grinning toothily at him atop rustic shelves to the bottles of unidentifiable solutions that glistened beneath, the outer room was a cornucopia of traditional folk medicine ingredients and occult appurtenances.
The little girl grinned toothily, as fair and fat a child as one might hope to find.
The moving picture on the front showed a curly-haired witch who was smiling toothily and pointing at a large sponge cake with her wand.
Aviendha grinned toothily at her, and Rainyn must have been watching at least a little, because her cheeks reddened beneath the sheen of sweat.
All five were now smiling toothily, the Katrien who might or might not have been following her, a little toothier than the rest.