From kakos; badness, i.e. (subjectively) depravity, or (actively) malignity, or (passively) trouble -- evil, malice(-iousness), naughtiness, wickedness.
KJV: Take therefore no thought for the morrow: for the morrow shall take thought for the things of itself. Sufficient unto the day is the evil thereof.
NASB: "So do not worry about tomorrow; for tomorrow will care for itself. Each day has enough trouble of its own.
KJV: Being filled with all unrighteousness, fornication, wickedness, covetousness, maliciousness; full of envy, murder, debate, deceit, malignity; whisperers,
NASB: being filled with all unrighteousness, wickedness, greed, evil; full of envy, murder, strife, deceit, malice; they are gossips,
KJV: Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth.
NASB: Therefore let us celebrate the feast, not with old leaven, nor with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth.