'Evil' in the Bible

Do not let unwholesome [foul, profane, worthless, vulgar] words ever come out of your mouth, but only such speech as is good for building up others, according to the need and the occasion, so that it will be a blessing to those who hear [you speak].

And do not grieve the Holy Spirit of God [but seek to please Him], by whom you were sealed and marked [branded as God’s own] for the day of redemption [the final deliverance from the consequences of sin].

making the very most of your time [on earth, recognizing and taking advantage of each opportunity and using it with wisdom and diligence], because the days are [filled with] evil.

Therefore, put on the complete armor of God, so that you will be able to [successfully] resist and stand your ground in the evil day [of danger], and having done everything [that the crisis demands], to stand firm [in your place, fully prepared, immovable, victorious].