In a manner that becomes progressively smaller, weaker, or less noticeable over time.
From 'diminishing' (present participle of diminish) plus the adverbial suffix '-ly,' which converts adjectives and participles into adverbs describing how an action occurs. The formation follows standard English adverb patterns.
When you say something is happening 'diminishingly,' you're describing that moment-by-moment fade—like how a song's echo gets smaller and smaller—the word itself performs what it describes!
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