The word(s) "weak" appears 23 time(s) in 20 verse(s) in Quran in Muhammad Pickthal translation.

(11) They said: O Shu'eyb! We understand not much of that thou tellest, and lo! we do behold thee weak among us. But for thy family, we should have stoned thee, for thou art not strong against us.

(12) Say: As for him who is in error, the Beneficent will verily prolong his span of life until, when they behold that which they were promised, whether it be punishment (in the world), or the Hour (of doom), they will know who is worse in position and who is weaker as an army.

(13) O mankind! A similitude is coined, so pay ye heed to it: Lo! those on whom ye call beside Allah will never create a fly though they combine together for the purpose. And if the fly took something from them, they could not rescue it from it. So weak are (both) the seeker and the sought!

(14) Allah is He Who shaped you out of weakness, then appointed after weakness strength, then, after strength, appointed weakness and grey hair. He createth what He will. He is the Knower, the Mighty.

(15) And We have enjoined upon man concerning his partners - His mother beareth him in weakness upon weakness, and his weaning is in two years - Give thanks unto Me and unto thy parents. Unto Me is the journeying.

(16) He whom we bring unto old age, We reverse him in creation (making him go back to weakness after strength). Have ye then no sense?

(17) And when they wrangle in the Fire, the weak say unto those who were proud: Lo! we were a following unto you; will ye therefor rid us of a portion of the Fire?

(18) They say: Surely, if we return to Al-Madinah the mightier will soon drive out the weaker; when might belongeth to Allah and to His messenger and to the believers; but the hypocrites know not.

(19) Then look again and yet again, thy sight will return unto thee weakened and made dim.

(20) Till (the day) when they shall behold that which they are promised (they may doubt); but then they will know (for certain) who is weaker in allies and less in multitude.