What does « Vain / False » mean in the Quran?

O you who have believed, do not consume one another's wealth unjustly but only [in lawful] business by mutual consent. And do not kill yourselves [or one another]. Indeed, Allah is to you ever Merciful.

And [for] their taking of usury while they had been forbidden from it, and their consuming of the people's wealth unjustly. And we have prepared for the disbelievers among them a painful punishment.

So the truth was established, and abolished was what they were doing.

Indeed, those [worshippers] - destroyed is that in which they are [engaged], and worthless is whatever they were doing."

Or [lest] you say, "It was only that our fathers associated [others in worship] with Allah before, and we were but descendants after them. Then would You destroy us for what the falsifiers have done?"

That He should establish the truth and abolish falsehood, even if the criminals disliked it.

O you who have believed, indeed many of the scholars and the monks devour the wealth of people unjustly and avert [them] from the way of Allah. And those who hoard gold and silver and spend it not in the way of Allah - give them tidings of a painful punishment.

And when they had thrown, Moses said, "What you have brought is [only] magic. Indeed, Allah will expose its worthlessness. Indeed, Allah does not amend the work of corrupters.

Those are the ones for whom there is not in the Hereafter but the Fire. And lost is what they did therein, and worthless is what they used to do.

He sends down from the sky, rain, and valleys flow according to their capacity, and the torrent carries a rising foam. And from that [ore] which they heat in the fire, desiring adornments and utensils, is a foam like it. Thus Allah presents [the example of] truth and falsehood. As for the foam, it vanishes, [being] cast off; but as for that which benefits the people, it remains on the earth. Thus does Allah present examples.

And Allah has made for you from yourselves mates and has made for you from your mates sons and grandchildren and has provided for you from the good things. Then in falsehood do they believe and in the favor of Allah they disbelieve?

And say, "Truth has come, and falsehood has departed. Indeed is falsehood, [by nature], ever bound to depart."

And We send not the messengers except as bringers of good tidings and warners. And those who disbelieve dispute by [using] falsehood to [attempt to] invalidate thereby the truth and have taken My verses, and that of which they are warned, in ridicule.

Rather, We dash the truth upon falsehood, and it destroys it, and thereupon it departs. And for you is destruction from that which you describe.

That is because Allah is the Truth, and that which they call upon other than Him is falsehood, and because Allah is the Most High, the Grand.

And you did not recite before it any scripture, nor did you inscribe one with your right hand. Otherwise the falsifiers would have had [cause for] doubt.

Say, "Sufficient is Allah between me and you as Witness. He knows what is in the heavens and earth. And they who have believed in falsehood and disbelieved in Allah - it is those who are the losers."

Have they not seen that We made [Makkah] a safe sanctuary, while people are being taken away all around them? Then in falsehood do they believe, and in the favor of Allah they disbelieve?

And We have certainly presented to the people in this Qur'an from every [kind of] example. But, [O Muhammad], if you should bring them a sign, the disbelievers will surely say, "You [believers] are but falsifiers."

That is because Allah is the Truth, and that what they call upon other than Him is falsehood, and because Allah is the Most High, the Grand.

Say, "The truth has come, and falsehood can neither begin [anything] nor repeat [it]."

And We did not create the heaven and the earth and that between them aimlessly. That is the assumption of those who disbelieve, so woe to those who disbelieve from the Fire.

The people of Noah denied before them and the [disbelieving] factions after them, and every nation intended [a plot] for their messenger to seize him, and they disputed by [using] falsehood to [attempt to] invalidate thereby the truth. So I seized them, and how [terrible] was My penalty.

And We have already sent messengers before you. Among them are those [whose stories] We have related to you, and among them are those [whose stories] We have not related to you. And it was not for any messenger to bring a sign [or verse] except by permission of Allah. So when the command of Allah comes, it will be concluded in truth, and the falsifiers will thereupon lose [all].

Falsehood cannot approach it from before it or from behind it; [it is] a revelation from a [Lord who is] Wise and Praiseworthy.