pure evil en · ADJ
Etymology
Has been rising in usage from other phrases using this sense of pure since around the 1950s. Has been rising exponentially as a set phrase since the 1990s.
Meanings
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(not-comparable, qualifier:set phrase) Absolutely evil; having no sense of morality or mercy whatsoever.
This, as I take it, was because all human beings, as we meet them, are commingled out of good and evil: and Edward Hyde, alone in the ranks of mankind, was pure evil.
1886 January 5, Robert Louis Stevenson, “Henry Jekyll’s Full Statement of the Case”, in Strange Case of Dr Jekyll and Mr Hyde, London: Longmans, Green, and Co., →OCLC, page 114: