Superlative form of flinty: most flinty.(adjective)
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Use "flintiest" in a sentence
"For the most part even the flintiest horseman and women in that neck of the woods are pro-choice, ambivalent at best about The War On Terror, and favor the decriminalization of drugs."
"Only the flintiest churl would look at this and find nothing to rejoice in."
"Those people saved at a level that would have won the admiration of the flintiest resident of Wuhan."