The word(s) "fruitless" appears 5 time(s) in 5 verse(s) in Quran in Muhammad Pickthal translation.

(1) Those who deny Our revelations and the meeting of the Hereafter, their works are fruitless. Are they requited aught save what they used to do?

(2) Those are they for whom is naught in the Hereafter save the Fire. (All) that they contrive here is vain and (all) that they are wont to do is fruitless.

(3) Being sparing of their help to you (believers). But when the fear cometh, then thou (Muhammad) seest them regarding thee with rolling eyes like one who fainteth unto death. Then, when the fear departeth, they scald you with sharp tongues in their greed for wealth (from the spoil). Such have not believed. Therefor Allah maketh their deeds fruitless. And that is easy for Allah.

(4) That is because they are averse to that which Allah hath revealed, therefor maketh He their actions fruitless.

(5) Lo! those who disbelieve and turn from the way of Allah and oppose the messenger after the guidance hath been manifested unto them, they hurt Allah not a jot, and He will make their actions fruitless.