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adjective, beast·li·er, beast·li·est.
  1. of or like a beast; bestial.
  2. Informal. nasty; unpleasant; disagreeable.
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  1. Chiefly British Informal. very; exceedingly: It's beastly cold out.
  2. British Informal. disagreeably; outrageously: beastly rude.
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Origin of beastly

1175–1225; Middle English beasteliche, later be(e)stly. See beast, -ly
Related formsbeast·li·ness, noun


See more synonyms for beastly on Thesaurus.com
2. abominable, hateful, vile, foul, mean, disgusting.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for beastly


adjective -lier or -liest
  1. informal unpleasant; disagreeable; nastybeastly weather
  2. obsolete of or like a beast; bestial
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  1. informal (intensifier)the weather is so beastly hot
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Derived Formsbeastliness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for beastly


c.1200, "brutish, sensual, debased;" late 14c., "in the manner of a beast," from beast + -ly (1). Weakened in British upper crust use to "awfully, exceedingly" by mid-19c. Beastly drunk is from 1803.

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Online Etymology Dictionary, © 2010 Douglas Harper