In a manner that pours out or expresses with abundant emotion and enthusiasm; with unrestrained warmth.
Adverbial form of 'effuse' or 'effusive,' created by adding the suffix '-ly' to describe the manner of expressing or pouring forth.
When someone thanks you 'effusely,' they're not being polite in a measured way—they're pouring out gratitude so enthusiastically that it spreads all around you, which is much warmer and more emotional than a simple 'thank you.'
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