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From LSJ

πολλὰ τὰ δεινὰ κοὐδὲν ἀνθρώπου δεινότερον πέλειmany things are formidable, and none more formidable than man | wonders are many, and none is more wonderful than man | many things are bad, but nothing is more atrocious than man

Source

Russian > Greek

ἀγριαίνω, ἀπαγριόομαι, θηριόομαι