Beastly vs Loathesome - What's the difference?

Beastly is a synonym of loathesome.

(en-adj)

(UK) Pertaining to, or having the form, nature or habits of, a beast.

(UK) Characterizing the nature of a beast; contrary to the nature and dignity of man; brutal; filthy.

(UK, dated) Abominable.

beastly weather

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

* (like a beast) bestial, animalian

(en adverb)

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.

Loathesome has no English definition. It may be misspelled.