It is a formal term. In everyday conversation, people are more likely to use "dehumanize" or "brutalize" to convey the same meaning.
BESTIALITY definition in American English - Collins Dictionary bestialize
Describing how certain conditions, like war, can "bestialize" participants by stripping away their humanity. It is a formal term
While related by root, "bestialize" is a verb describing a process of degradation, whereas "bestiality" refers to specific sexual acts between humans and animals. to brutalize or deprave. Common Contexts:
To reduce to the state of a beast; to brutalize or deprave. Common Contexts: