In a manner that shows or emphasizes contrast; with notable or striking differences.
From 'contrasting' (present participle of contrast, showing differences) plus the adverbial suffix '-ly'. The modern standard adverbial form of the contrast family.
The '-ingly' ending is fascinating—'contrastingly' feels smoother and more natural to English speakers than 'contrastedly,' so it became the standard even though both are grammatically valid.
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