unshakably
Adverb
Meaning
with determination; in a determined manner
Source: WordNetSynonyms
determinedly
unfalteringly
completely
strongly
FAST
clearly
indeed
certainly
totally
steadily
absolutely
firmly
thoroughly
definitely
inevitably
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Antonyms
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I was a normal child. Which is to say, I was selfish and I was not entirely convinced of the existence of things that were not me, and I was certain, rock-solid unshakably certain, that I was the most important thing in creation. There was nothing that was more important to me than I was.
I think a fundamentalist is somebody who believes something unshakably and isn't going to change their mind.
he clung to the past determinedly