of or like a beast; bestial.

Informal . nasty; unpleasant; disagreeable.

Chiefly British Informal . very; exceedingly

It's beastly cold out.

British Informal . disagreeably; outrageously

beastly rude.

adverb

good , kind , nice , superior , inoffensive

adverb

abominable , animal , barbarous , base , bestial , boorish , brutal , brute , brutish , carnal , coarse , cruel , degraded , depraved , disgusting , feral , ferine , foul , gluttonous , gross , inhuman , irrational , loathsome , low , monstrous , obscene , piggish , prurient , repulsive , sadistic , swinish , unclean , vile , awful , disagreeable , mean , nasty , revolting , rotten , terrible , unpleasant , bad , dreadful , offensive , vulgar