In a manner relating to or caused by a sudden, violent, and large-scale upheaval or disaster.
Formed from 'cataclysmic' + '-ally', following standard English adverb formation. Provides the adverbial form of the cataclysm-family words.
Notice how this word gets longer with each suffix layer: cataclysm → cataclysmic → cataclysmically—English loves stacking suffixes to shift parts of speech, creating increasingly specific grammatical shades of meaning.
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