κακοποιόςkakopoiós, kak-op-oy-os'; from G2556 and G4160; a bad-doer; (specially), a criminal:—evil-doer,
malefactor.
Thayer's Greek Lexicon
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STRONGS G2555:
κακοποιός, κακοποιον (κακόν and ποιέω), doing evil; a substantive, an evil-doer, malefactor: John 18:30 (but L marginal reading TTrWHκακόνποιῶν); 1 Peter 2:12, 14; 1 Peter 3:16 (TTr marginal reading WH omit the clause); 1 Peter 4:15. (Proverbs 12:4; Pindar, Aristotle, Polybius, Plutarch.)