The word(s) "understanding" appears 18 time(s) in 18 verse(s) in Quran in Muhammad Pickthal translation.

(11) This is a clear message for mankind in order that they may be warned thereby, and that they may know that He is only One Allah, and that men of understanding may take heed.

(12) (This is) a Scripture that We have revealed unto thee, full of blessing, that they may ponder its revelations, and that men of understanding may reflect.

(13) And We bestowed on him (again) his household and therewith the like thereof, a mercy from Us, and a memorial for men of understanding.

(14) Is he who payeth adoration in the watches of the night, prostrate and standing, bewaring of the Hereafter and hoping for the mercy of his Lord, (to be accounted equal with a disbeliever)? Say (unto them, O Muhammad): Are those who know equal with those who know not? But only men of understanding will pay heed.

(15) Who hear advice and follow the best thereof. Such are those whom Allah guideth, and such are men of understanding.

(16) Hast thou not seen how Allah hath sent down water from the sky and hath caused it to penetrate the earth as watersprings, and afterward thereby produceth crops of divers hues; and afterward they wither and thou seest them turn yellow; then He maketh them chaff. Lo! herein verily is a reminder for men of understanding.

(17) A guide and a reminder for men of understanding.

(18) Allah hath prepared for them stern punishment; so keep your duty to Allah, O men of understanding! O ye who believe! Now Allah hath sent down unto you a reminder,