In a manner that explains away or covers up the truth with flattery, smooth talk, or convenient excuses.
From glozing (the present participle of gloze, from Old French gloser) plus the adverbial suffix '-ly.' This creates an archaic adverb form rarely used in modern English.
This archaic adverb is wonderfully specific—'glozingly' describes exactly that tone of voice when someone's desperately trying to make something bad sound okay.
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