The word(s) "hard" appears 36 time(s) in 35 verse(s) in Quran in Muhammad Pickthal translation.

(21) I verily will punish him with hard punishment or I verily will slay him, or he verily shall bring me a plain excuse.

(22) Is not He (best) Who created the heavens and the earth, and sendeth down for you water from the sky wherewith We cause to spring forth joyous orchards, whose trees it never hath been yours to cause to grow. Is there any Allah beside Allah? Nay, but they are folk who ascribe equals (unto Him)!

(23) He said: Lo! I fain would marry thee to one of these two daughters of mine on condition that thou hirest thyself to me for (the term of) eight pilgrimages. Then if thou completest ten it will be of thine own accord, for I would not make it hard for thee. Allah willing, thou wilt find me of the righteous.

(24) That is not a hard thing for Allah.

(25) Is he whose bosom Allah hath expanded for Al-Islam, so that he followeth a light from his Lord, (as he who disbelieveth)? Then woe unto those whose hearts are hardened against remembrance of Allah. Such are in plain error.

(26) And verily, if We cause him to taste mercy after some hurt that hath touched him, he will say: This is my own; and I deem not that the Hour will ever rise, and if I am brought back to my Lord, I surely shall be better off with Him - But We verily shall tell those who disbelieve (all) that they did, and We verily shall make them taste hard punishment.

(27) I am surely better than this fellow, who is despicable and can hardly make (his meaning) plain!

(28) And verily We shall try you till We know those of you who strive hard (for the cause of Allah) and the steadfast, and till We test your record.

(29) Muhammad is the messenger of Allah. And those with him are hard against the disbelievers and merciful among themselves. Thou (O Muhammad) seest them bowing and falling prostrate (in worship), seeking bounty from Allah and (His) acceptance. The mark of them is on their foreheads from the traces of prostration. Such is their likeness in the Torah and their likeness in the Gospel - like as sown corn that sendeth forth its shoot and strengtheneth it and riseth firm upon its stalk, delighting the sowers - that He may enrage the disbelievers with (the sight of) them. Allah hath promised, unto such of them as believe and do good works, forgiveness and immense reward.

(30) Hastening toward the summoner; the disbelievers say: This is a hard day.