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

(61) O our people! Respond (with obedience) to Allah's Caller (i.e. Allah's Messenger Muhammad صلى الله عليه وسلم), and believe in him (i.e. believe in that which Muhammad صلى الله عليه وسلم has brought from Allah and follow him). He (Allah) will forgive you of your sins, and will save you from a painful torment (i.e. Hell-fire)

(62) Say (O Muhammad صلى الله عليه وسلم) to the bedouins who lagged behind: "You shall be called to fight against a people given to great warfare, then you shall fight them, or they shall surrender. Then if you obey, Allah will give you a fair reward; but if you turn away as you did turn away before, He will punish you with a painful torment."

(63) No blame or sin is there upon the blind, nor is there blame or sin upon the lame, nor is there blame or sin upon the sick (that they go not for fighting). And whosoever obeys Allah and His Messenger (Muhammad صلى الله عليه وسلم), He will admit him to Gardens beneath which rivers flow (Paradise); and whosoever turns back, He will punish him with a painful torment.

(64) They are the ones who disbelieved (in the Oneness of Allah - Islamic Monotheism) and hindered you from Al-Masjid-al-Haram (at Makkah) and detained the sacrificial animals from reaching their place of sacrifice. Had there not been believing men and believing women whom you did not know, that you may kill them and on whose account a sin would have been committed by you without (your) knowledge, that Allah might bring into His Mercy whom He wills - if they (the believers and the disbelievers) had been apart, We verily would have punished those of them who disbelieved with painful torment.

(65) And We have left there a sign (i.e. the place of the Dead Sea in Palestine) for those who fear the painful torment.

(66) And he who finds not (the money for freeing a slave) must fast two successive months before they both touch each other. And he who is unable to do so, should feed sixty Miskins (poor). That is in order that you may have perfect Faith in Allah and His Messenger. These are the limits set by Allah. And for disbelievers, there is a painful torment.

(67) They are like their immediate predecessors (the Jews of Banu Qainuqa', who suffered); they tasted the evil result of their conduct, and (in the Hereafter, there is) for them a painful torment.

(68) O you who believe! Shall I guide you to a trade that will save you from a painful torment?

(69) Has not the news reached you of those who disbelieved aforetime? And so they tasted the evil result of their disbelief, and theirs will be a painful torment.

(70) Say (O Muhammad صلى الله عليه وسلم): "Tell me! If Allah destroys me, and those with me, or He bestows His Mercy on us - who can save the disbelievers from a painful torment?"