In a manner that shows a broad smile or grin; while grinning or smiling widely.
Derived from 'grin' (Old English 'grennian,' to bare the teeth) combined with the '-ing' present participle form and the adverbial suffix '-ly,' creating an adverb describing the manner of an action.
Many adverbs add '-ly' to describe HOW something happens, but 'grinningly' is delightfully specific—it tells us not just that someone spoke or acted, but that they did it with a big smile on their face, painting a complete picture!
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