Vanity, is it a Sin?

Is Vanity Sin? From KJV Word Book:

VANITY occurs 98 times in KJ, but never in the sense of conceit or undue self-esteem. It means emptiness, worthlessness, futility, or is applied to things that are empty, worthless, or futile. The word appears 37 times in the Book of Ecclesiastes, and is there retained by RSV. The keynote of the book is set in the opening verses:

“Vanity of vanities, says the Preacher,
vanity of vanities! All is vanity.
What does man gain by all the toil
at which he toils under the sun?”

The Preacher’s refrain, “all is vanity and vexation of spirit,” is better translated “all is vanity and a striving after wind” (1:14, etc.).

Outside the book of Ecclesiastes, RSV generally uses English terms that are closer to the primary meaning of the several Hebrew and Greek words for which KJ uses “vanity.” “Man is like to vanity” (Psalm 144:4) means “Man is like a breath.” “Vanity shall take them” (Isaiah 57:13) means “a breath will take them away.” “They are altogether lighter than vanity” (Psalm 62:9) means “they are together lighter than a breath.” “Therefore their days did he consume in vanity” (Psalm 78:33) means “So he made their days vanish like a breath.”

For “vanity” RSV also uses “empty” and “emptiness” (Job 7:3; 15:31; 35:13; Psalm 41:6; Isaiah 40:17; 59:4); “worthless” and “worthlessness” (Jeremiah 2:5; 10:15; 16:19; 51:18); “false,” “falsehood,” “lies,” “delusions,” “delusive visions” (Job 31:5; Psalms 12:2; 24:4; 144:8; Isaiah 5:18; Ezekiel 13:6, 8, 9, 23; 21:29; 22:28). Agur’s prayer is translated (Proverbs 30:8):
“Remove far from me falsehood and lying;
give me neither poverty nor riches;
feed me with the food that is needful for me.”

The word “vanity” is used in KJ for idolatry and idols. “Are there any among the vanities of the Gentiles that can cause rain?” (Jeremiah 14:22) means “Are there any among the false gods of the nations that can bring rain?” “Strange vanities” (Jeremiah 8:19) are “foreign idols.” “Lying vanities” (Psalm 31:6; Jonah 2:8) are “vain idols.”
“They have provoked me to anger with their vanities” (Deuteronomy 32:21) means “they have provoked me with their idols”; so also 1 Kings 16:13, 26. “The stock is a doctrine of vanities” (Jeremiah 10:8) is a cryptic rendering of Hebrew which means “the instruction of idols is but wood!”

*KJ uses “vanity” occasionally for one of the Hebrew words which mean iniquity. “They conceive mischief, and bring forth vanity” (Job 15:35) means “they conceive mischief and bring forth evil.” “Under his tongue is mischief and vanity” (Psalm 10:7) is better translated “under his tongue are mischief and iniquity.” “He that soweth iniquity shall reap vanity” (Proverbs 22:8) is more accurately rendered “He who sows injustice will reap calamity.”
In the New Testament RSV replaces “vanity” with “futility” (Romans 8:20; Ephesians 4:17) and “folly” (2 Peter 2:18).


*In my opinion, this is not so because mischief is evil, God's said He creates it. Therefore to conceive mischief is not to bring about vanity because vanity is already the source of it; man was subjected to it before he transgressed to become the snake that eats its own tail. "Eros".

8 He that soweth iniquity shall reap vanity: and the rod of his anger shall fail and the rod...: or, with the rod of his anger he shall be consumed (Pr 22:8).

In your iniquity shall vanity possess you and your conceit will prove you, worthless.