The word(s) "painful" appears 75 time(s) in 75 verse(s) in Quran in Mohsin Khan translation.

(41) Verily, those who like that (the crime of) illegal sexual intercourse should be propagated among those who believe, they will have a painful torment in this world and in the Hereafter. And Allah knows and you know not.

(42) Make not the calling of the Messenger (Muhammad صلى الله عليه وسلم) among you as your calling one of another. Allah knows those of you who slip away under shelter (of some excuse without taking the permission to leave, from the Messenger (صلى الله عليه وسلم). And let those who oppose the Messenger's (Muhammad صلى الله عليه وسلم) commandment (i.e. his Sunnah - legal ways, orders, acts of worship, statements) (among the sects) beware, lest some Fitnah (disbelief, trials, afflictions, earthquakes, killing, overpowered by a tyrant) should befall them or a painful torment be inflicted on them.

(43) And Nuh's (Noah) people, when they denied the Messengers, We drowned them, and We made them as a sign for mankind. And We have prepared a painful torment for the Zalimun (polytheists and wrong-doers).

(44) They will not believe in it until they see the painful torment.

(45) And those who disbelieve in the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) of Allah and the Meeting with Him, it is they who have no hope of My Mercy: and it is they who will have a painful torment.

(46) And when Our Verses (of the Qur'an) are recited to such a one, he turns away in pride, as if he heard them not - as if there were deafness in his ear. So announce to him a painful torment.

(47) That He may ask the truthful (Allah's Messengers and His Prophets) about their truth (i.e. the conveyance of Allah's Message that which they were charged with). And He has prepared for the disbelievers a painful torment (Hell-fire).

(48) But those who strive against Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) to frustrate them - those, for them will be a severe painful torment.

(49) They (people) said: "For us, we see an evil omen from you: if you cease not, we will surely stone you, and a painful torment will touch you from us."

(50) Outcast, and theirs is a constant (or painful) torment.