In a way that involves giving insincere praise or flattery; in a manner that compliments excessively.
From 'flattering' (the adjective/present participle of 'flatter') + the adverbial suffix '-ly,' which transforms adjectives into adverbs.
The adverb form reveals something interesting: even when we describe HOW someone speaks (flatteringly), we're making a judgment about their sincerity—language itself calls out dishonesty!
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