The word(s) "weak" appears 45 time(s) in 41 verse(s) in Quran in Mohsin Khan translation.

(11) And don't be weak in the pursuit of the enemy; if you are suffering (hardships) then surely, they (too) are suffering (hardships) as you are suffering, but you have a hope from Allah (for the reward, i.e. Paradise) that for which they hope not; and Allah is Ever All-Knowing, All-Wise.

(12) They ask your legal instruction concerning women, say: Allah instructs you about them, and about what is recited unto you in the Book concerning the orphan girls whom you give not the prescribed portions (as regards Mahr and inheritance) and yet whom you desire to marry, and (concerning) the children who are weak and oppressed, and that you stand firm for justice to orphans. And whatever good you do, Allah is Ever All-Aware of it.

(13) The leaders of those who were arrogant among his people said to those who were counted weak - to such of them as believed: "Know you that Salih is one sent from his Lord." They said: "We indeed believe in that with which he has been sent."

(14) And We made the people who were considered weak to inherit the eastern parts of the land and the western parts thereof which We have blessed. And the fair Word of your Lord was fulfilled for the Children of Israel, because of their endurance. And We destroyed completely all the great works and buildings which Fir'aun (Pharaoh) and his people erected.

(15) And when Musa (Moses) returned to his people, angry and grieved, he said: "What an evil thing is that which you have done (i.e. worshipping the calf) during my absence. Did you hasten and go ahead as regards the matter of your Lord (you left His worship)?" And he threw down the Tablets and seized his brother by (the hair of) his head and dragged him towards him. Harun (Aaron) said: "O son of my mother! Indeed the people judged me weak and were about to kill me, so make not the enemies rejoice over me, nor put me amongst the people who are Zalimun (wrong-doers)."

(16) This (is the fact) and surely, Allah weakens the deceitful plots of the disbelievers.

(17) And remember when you were few and were reckoned weak in the land, and were afraid that men might kidnap you, but He provided a safe place for you, strengthened you with His Help, and provided you with good things so that you might be grateful.

(18) Now Allah has lightened your (task), for He knows that there is weakness in you. So if there are of you a hundred steadfast persons, they shall overcome two hundreds, and if there are a thousand of you, they shall overcome two thousand with the Leave of Allah. And Allah is with As-Sabirun (the patient).

(19) There is no blame on those who are weak or ill or who find no resources to spend [in holy fighting (Jihad)], if they are sincere and true (in duty) to Allah and His Messenger. No ground (of complaint) can there be against the Muhsinun (good-doers - See the footnote of V.9:120). And Allah is Oft-Forgiving, Most Merciful.

(20) They said: "O Shu'aib! We do not understand much of what you say, and we see you weak (it is said that he was a blind man) among us. Were it not for your family, we should certainly have stoned you and you are not powerful against us."