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Use "witheringly" in a sentence
"She blamed Simpson - whom she referred to witheringly as "that woman" - for forcing her husband onto the throne."
"The tone that's employed may vary from witheringly critical to mildly and politely condescending."
"The novel, poem or essay you write today, in full confidence of its genius, may be regarded by some later version of yourself as soul-witheringly dreadful."