Greek
4190. poneros -- toilsome, bad ... which refers rather to essential 
character, as well 
... plural) guilt; masculine (singular)
 the 
devil, or (plural 
... evil, grievous, harm, lewd, malicious, 
wicked(-ness 
... /greek/4190.htm - 8kTorrey's TopicalTextbook
1 John 2:13I write to you, fathers, because you have known him that is from the beginning. I write to you, young men, because you have overcome the wicked one. I write to you, little children, because you have known the Father.
Torrey's Topical Textbook—AKJV