In a manner relating to or characteristic of dynamite; with explosive force or effect.
From dynamitical + -ly (adverb suffix). This adverbial form evolved from the adjective to describe actions or changes happening with explosive intensity.
This is one of the longest words in everyday English that refers back to a single historical invention—every time you read or hear it, you're essentially saying 'in the manner of Alfred Nobel's 1867 breakthrough.'
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