In a manner that expresses or reveals prophecy or the power to predict fate.
From 'fatidical' + '-ly' adverb suffix. The adverb form developed in the 1700s-1800s for literary and philosophical discourse about prophecy and destiny.
Adding '-ly' to 'fatidical' creates an adverb that describes actions or speech filled with prophetic weight—imagine someone speaking 'fatidically' about the future with such certainty that everyone believes them, even if they can't explain why.
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