The word(s) "countless" appears 3 time(s) in 3 verse(s) in Quran in Abdullah Yusuf Ali translation.

(1) O mankind! reverence your Guardian-Lord, who created you from a single person, created, of like nature, His mate, and from them twain scattered (like seeds) countless men and women;- reverence Allah, through whom ye demand your mutual (rights), and (reverence) the wombs (That bore you): for Allah ever watches over you.

(2) But how many (countless) generations before them have we destroyed, who were even better in equipment and in glitter to the eye?

(3) But how many (countless) generations before them have We destroyed? Canst thou find a single one of them (now) or hear (so much as) a whisper of them?