The word(s) "understand" appears 46 time(s) in 46 verse(s) in Quran in Muhammad Pickthal translation.

(11) And when ye call to prayer they take it for a jest and sport. That is because they are a folk who understand not.

(12) Say: The evil and the good are not alike even though the plenty of the evil attract thee. So be mindful of your duty to Allah, O men of understanding, that ye may succeed.

(13) Of them are some who listen unto thee, but We have placed upon their hearts veils, lest they should understand, and in their ears a deafness. If they saw every token they would not believe therein; to the point that, when they come unto thee to argue with thee, the disbelievers say: This is naught else than fables of the men of old.

(14) Say: He is able to send punishment upon you from above you or from beneath your feet, or to bewilder you with dissension and make you taste the tyranny one of another. See how We display the revelations so that they may understand.

(15) And He it is Who hath produced you from a single being, and (hath given you) a habitation and a repository. We have detailed Our revelations for a people who have understanding.

(16) Already have We urged unto hell many of the jinn and humankind, having hearts wherewith they understand not, and having eyes wherewith they see not, and having ears wherewith they hear not. These are as the cattle - nay, but they are worse! These are the neglectful.

(17) And whenever a surah is revealed, they look one at another (as who should say): Doth anybody see you? Then they turn away. Allah turneth away their hearts because they are a folk who understand not.

(18) 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.

(19) Lo! We have revealed it, a Lecture in Arabic, that ye may understand.

(20) In their history verily there is a lesson for men of understanding. It is no invented story but a confirmation of the existing (Scripture) and a detailed explanation of everything, and a guidance and a mercy for folk who believe.