The word(s) "foolishly" appears 1 time(s) in 1 verse(s) in Quran in Muhammad Habib Shakir translation.

(1) They are lost indeed who kill their children foolishly without knowledge, and forbid what Allah has given to them forging a lie against Allah; they have indeed gone astray, and they are not the followers of the right course.

(سورة الأنعام, Al-An'aam, Chapter #6, Verse #140)
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