'Vain' in the Bible

Why do the nations rage, And the peoples meditate a vain thing?

A horse is a vain thing for safety; Neither doth he deliver any by his great power.

Surely every man walketh in a vain show; Surely they are disquieted in vain: He heapeth up riches , and knoweth not who shall gather them.

Give us help against the adversary; For vain is the help of man.

Trust not in oppression, And become not vain in robbery: If riches increase, set not your heart thereon .

Surely in vain have I cleansed my heart, And washed my hands in innocency;

Give us help against the adversary; For vain is the help of man.

Except Jehovah build the house, They labor in vain that build it: Except Jehovah keep the city, The watchman waketh but in vain.

It is vain for you to rise up early, To take rest late, To eat the bread of toil; For'so he giveth unto his beloved sleep.

For they speak against thee wickedly, And thine enemies take thy name in vain.