Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or resembling a beast; bestial.
  • adj. Very disagreeable; unpleasant.
  • adv. Chiefly British To an extreme degree; very.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Pertaining to, or having the form, nature, or habits of a beast.
  • adj. Characterizing the nature of a beast; contrary to the nature and dignity of man; brutal; filthy.
  • adj. Abominable
  • adv. Like a beast; brutishly.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Pertaining to, or having the form, nature, or habits of, a beast.
  • adj. Characterizing the nature of a beast; contrary to the nature and dignity of man; brutal; filthy.
  • adj. Abominable.

from The Century Dictionary and Cyclopedia

  • Natural; animal: the opposite of spiritual.
  • Like a beast in form or nature; animal.
  • Like a beast in conduct or instincts; brutal; filthy; coarse.
  • Befitting a beast; unfit for human use; filthy; abominable.
  • Nasty; disagreeable: as, beastly weather.
  • Synonyms Brutal, Bestial, etc. See brute.
  • In the manner of a beast; filthily; abominably.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. very unpleasant
  • adj. resembling a beast; showing lack of human sensibility
  • adv. in a beastly manner

Etymologies

From beast +‎ -ly. (Wiktionary)

Examples

  • Well, actually, the term beastly means beastly for a reason: because this is how beasts behave.

    Independent.ie - Frontpage RSS Feed

  • To such a being the golden gates are closed; and the Easterners, whom he despised for what he termed their beastly lethargies, have taught me the real secret of the poppy.

    The Yellow Claw

  • We cross lakes in beastly winds, whitecaps slopping over the sides of the canoes, then grind out in bony streambeds where the water dribbles through hundreds of yards of boulder and cobble.

    Field and Stream Adventure: The Search for the Best Brook Trout Spot on Earth

  • I say, I beg your pardon, frightfully — I'm afraid I'm bein 'beastly long-winded.

    Whose Body?

  • "What do you call the beastly stuff?" asked Telson.

    The Willoughby Captains

  • "They would have been glad enough of some of the weather you call beastly," said Hester, again pulling through a stiff needle, this time without any smile, for sometimes that brother was more than she could bear.

    Weighed and Wanting

  • Highlands, as they call their beastly wildernesses, (no offence again,)

    Woodstock; or, the Cavalier

  • "You've come back what I call a beastly sneak, you know, this term.

    Vice Versa or A Lesson to Fathers

  • That the world should be beastly is natural, but that the faithful bride should become the whore is monstrous, and excites the same amazement in him as the same awful change in Israel excited in

    Commentary Critical and Explanatory on the Whole Bible

  • (To avoid the overdone word beastly—which however happens to be the right one here; bestial describes character or conduct)

    Style.

Comments

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  • Whose mother is beastly dead.

    Joyce, Ulysses, 7

    January 2, 2007