In an adscititious manner; by external acquisition or addition; not inherently.
From 'adscititious' + '-ly' adverbial suffix. The long chain of Latin-derived affixes makes this word particularly cumbersome and explains why it never gained traction in English.
When you add '-ly' to an already rare word ending in '-ious,' you get these tongue-twisting adverbs that probably nobody has genuinely used since the 1700s—perfect examples of words that sound impressive but are mostly dead.
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