Etymology
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bestial (adj.)

late 14c., "belonging to a beast," c. 1400, "having the qualities of a beast," from Old French bestial (13c.) "relating to animals; beast-like, stupid, foolish, brutal" and directly from Latin bestialis "like a beast," from bestia (see beast). Sense of "below the dignity of a human" in English is from c. 1400, and in many cases does injustice to the beasts. When the beast of the Book of Revelation was meant, the adjectival form bestian (1650s) sometimes was used.

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Definitions of bestial

bestial (adj.)
resembling a beast; showing lack of human sensibility;
a bestial nature
bestial treatment of prisoners
Synonyms: beastly / brute / brutish / brutal
From wordnet.princeton.edu