BEASTLIEST
BEASTLY
beastly, bestial, brute, brutish, brutal
(adjective) resembling a beast; showing lack of human sensibility; “beastly desires”; “a bestial nature”; “brute force”; “a dull and brutish man”; “bestial treatment of prisoners”
beastly, hellish, god-awful
(adjective) (informal) very unpleasant; “hellish weather”; “stop that god-awful racket”
Source: WordNet® 3.1
Adjective
beastliest
superlative form of beastly: most beastly
Source: Wiktionary
BEASTLY
Beast"ly, a.
1. Pertaining to, or having the form, nature, or habits of, a beast.
Beastly divinities and droves of gods. Prior.
2. Characterizing the nature of a beast; contrary to the nature and
dignity of man; brutal; filthy.
The beastly vice of drinking to excess. Swift.
3. Abominable; as, beastly weather. [Colloq. Eng.]
Syn.
– Bestial; brutish; irrational; sensual; degrading.
Source: Webster’s Unabridged Dictionary 1913 Edition