In a manner characterized by flattery or the behavior of a flatterer.
Derived from gnathonic or gnathonical with the addition of the adverbial suffix -ly, following standard English patterns for converting adjectives to adverbs.
Medieval scholars loved creating adverbs from Greek-rooted adjectives by adding -ly, which is why you see so many long, impressive-sounding words in old texts—they were basically the 'flex' of intellectual writing!
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