The word(s) "vain" appears 29 time(s) in 29 verse(s) in Quran in Muhammad Pickthal translation.

(1) Thus We have appointed you a middle nation, that ye may be witnesses against mankind, and that the messenger may be a witness against you. And We appointed the qiblah which ye formerly observed only that We might know him who followeth the messenger, from him who turneth on his heels. In truth it was a hard (test) save for those whom Allah guided. But it was not Allah's purpose that your faith should be in vain, for Allah is Full of Pity, Merciful toward mankind.

(2) O ye who believe! Render not vain your almsgiving by reproach and injury, like him who spendeth his wealth only to be seen of men and believeth not in Allah and the Last Day. His likeness is as the likeness of a rock whereon is dust of earth; a rainstorm smiteth it, leaving it smooth and bare. They have no control of aught of that which they have gained. Allah guideth not the disbelieving folk.

(3) Such as remember Allah, standing, sitting, and reclining, and consider the creation of the heavens and the earth, (and say): Our Lord! Thou createdst not this in vain. Glory be to Thee! Preserve us from the doom of Fire.

(4) And Allah would turn to you in mercy; but those who follow vain desires would have you go tremendously astray.

(5) This day are (all) good things made lawful for you. The food of those who have received the Scripture is lawful for you, and your food is lawful for them. And so are the virtuous women of the believers and the virtuous women of those who received the Scripture before you (lawful for you) when ye give them their marriage portions and live with them in honour, not in fornication, nor taking them as secret concubines. Whoso denieth the faith, his work is vain and he will be among the losers in the Hereafter.

(6) Say: O People of the Scripture! Stress not in your religion other than the truth, and follow not the vain desires of folk who erred of old and led many astray, and erred from a plain road.

(7) Such is the guidance of Allah wherewith He guideth whom He will of His bondmen. But if they had set up (for worship) aught beside Him, (all) that they did would have been vain.

(8) Thus was the Truth vindicated and that which they were doing was made vain.

(9) Lo! as for these, their way will be destroyed and all that they are doing is in vain.

(10) It is not for the idolaters to tend Allah's sanctuaries, bearing witness against themselves of disbelief. As for such, their works are vain and in the Fire they will abide.