Wiktionary
unshakably
adv. In an unshakable manner.
WordNet
unshakably
adv. in a determined manner; "he clung to the past determinedly" [syn: determinedly, unfalteringly, with determination]
Usage examples of "unshakably".
It was apparent that that "code" was what Rojan lived by, and that he believed in it unshakably.
Pressboard was a retired person who believed, unshakably, that all of Will's stuff had really been written by the earl of Oxford.