The word(s) "folly" appears 6 time(s) in 6 verse(s) in Quran in Abdullah Yusuf Ali translation.

(1) And who turns away from the religion of Abraham but such as debase their souls with folly? Him We chose and rendered pure in this world: And he will be in the Hereafter in the ranks of the Righteous.

(2) Lost are those who slay their children, from folly, without knowledge, and forbid food which Allah hath provided for them, inventing (lies) against Allah. They have indeed gone astray and heeded no guidance.

(3) He said: "O my Lord! the prison is more to my liking than that to which they invite me: Unless Thou turn away their snare from me, I should (in my youthful folly) feel inclined towards them and join the ranks of the ignorant."

(4) (As if) to show their ingratitude for the favours we have bestowed on them! then enjoy (your brief day): but soon will ye know (your folly)!

(5) (As if) to show their ingratitude for the (favours) We have bestowed on them! Then enjoy (your brief day); but soon will ye know (your folly).

(6) 'True, there were persons among mankind who took shelter with persons among the Jinns, but they increased them in folly.