In a gushing manner; with an uncontrolled outpouring of fluid or emotion.
From gush plus present participle '-ing' plus adverb '-ly', creating a double-suffix adverbial form emphasizing the continuous action.
Words ending in '-ingly' (like 'accordingly' or 'laughingly') suggest both the action and the manner simultaneously—'gushingly' captures both the flowing action and the emotional excessiveness in one word.
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