beastly

UK: /ˈbiːstli/ US: /ˈbistli/ ,(bēst′lē)

Inflections of 'beastly' (adj):

beastlier

adj comparative

beastliest

adj superlative

WordReference Random House Learner's Dictionary of American English © 2025

beast•ly /ˈbistli/   adj., -li•er, -li•est, adv. 
adj. 

1. of or like a beast;
   bestial:
   the beastly sounds in the barnyard.
2. Informal Terms nasty;
   unpleasant;
   disagreeable;
   unkind:
   beastly weather; beastly behavior.

adv. 

3. British Terms Chiefly Brit. Informal. very;
   exceedingly:
   It's beastly cold outside.

beast•li•ness, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2025

beast•ly  (bēst′lē), adj., -li•er, -li•est, adv. 
adj. 

1. of or like a beast;
   bestial.
2. Informal Terms nasty;
   unpleasant;
   disagreeable.

adv. 

3. British Terms [Chiefly Brit. Informal.] very;
   exceedingly:
   It's beastly cold out.
4. British Terms disagreeably;
   outrageously:
   beastly rude.

• Middle English beasteliche, later be(e)stly. See beast, -ly¹ 1175–1225

beast′li•ness, n. 
Synonyms

• 2. abominable, hateful, vile, foul, mean, disgusting.

Collins Concise English Dictionary © HarperCollins Publishers::

beastly / ˈbiːstlɪ/ adjective ( -lier, -liest)

1. unpleasant; disagreeable; nasty: beastly weather
2. of or like a beast; bestial

adverb

1. (intensifier): the weather is so beastly hot

ˈbeastliness noun