κακός (kakós|kak-os'|adjective|evil)
[Grk] κακός LN: 20.18, 65.26, 72.22, 88.106 GK: G2805 Hebrew: אִוֶּלֶת‎, אָוֶן‎, אֱלִיל‎, הָלַךְ‎, זִמָּה‎, לוּץ‎, מָדֹון‎, מַעֲשֶׂה‎, מַצָּה‎, מְרֹרָה‎, עֶוֶל‎, עָמָל‎, צַר‎, רִיב‎, רַע‎, רָעַע‎, רֶשַׁע‎, שֹׁד‎
Derivation: apparently a primary word;
Strong's: worthless (intrinsically, such; whereas πονηρός properly refers to effects), i.e. (subjectively) depraved, or (objectively) injurious
KJV: --bad, evil, harm, ill, noisome, wicked.
See: πονηρός