Comparative form of beastly: more beastly(adjective)
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Use "beastlier" in a sentence
"The main thing that has been achieved by the recent diplomatic maneuvers is what Washington considers to be a more favorable public-relations ambience for making the war bigger, bloodier, and beastlier."
"He scanned Shaftesbury Avenue with a jaundiced eye, and thought that he had never seen a beastlier thoroughfare."
"I think that I was beastlier than I meant to be, but I am not accustomed to young kids."