Beastly

Origin

From beast + -ly.

Full definition of beastly

Adjective

1. (UK) Pertaining to, or having the form, nature, or habits of, a beast.
2. (UK) Characterizing the nature of a beast; contrary to the nature and dignity of man; brutal; filthy.
3. (UK) Abominable.beastly weather

Usage notes

Most often used pejoratively. Bestial is more narrow, though also often used pejoratively.

Synonyms

• (like a beast) bestial, animalian

Adverb

1. Like a beast; brutishly.
• 1590, Edmund Spenser, The Faerie Queene, III.8:Beastly he threwe her downe, ne car'd to spill
  Her garments gay with scales of fish that all did fill.
• 1901, The Literary World - Volume 63 - Page 35:They have insulted me most beastly. Moreover, they are, everyone of them, black-satan filthmen.