'Grievous' in the Bible

And I set my mind to seek and explore by wisdom concerning all that has been done under heaven. It is a grievous task which God has given to the sons of men to be afflicted with.

So I hated life, for the work which had been done under the sun was grievous to me; because everything is futility and striving after wind.

Because all his days his task is painful and grievous; even at night his mind does not rest. This too is vanity.

There was a certain man without a dependent, having neither a son nor a brother, yet there was no end to all his labor. Indeed, his eyes were not satisfied with riches and he never asked, “And for whom am I laboring and depriving myself of pleasure?” This too is vanity and it is a grievous task.

There is a grievous evil which I have seen under the sun: riches being hoarded by their owner to his hurt.

This also is a grievous evil—exactly as a man is born, thus will he die. So what is the advantage to him who toils for the wind?