The word(s) "heedless" appears 26 time(s) in 26 verse(s) in Quran in Muhammad Habib Shakir translation.

(11) And certainly We have created for hell many of the jinn and the men; they have hearts with which they do not understand, and they have eyes with which they do not see, and they have ears with which they do not hear; they are as cattle, nay, they are in worse errors; these are the heedless ones.

(12) And remember your Lord within yourself humbly and fearing and in a voice not loud in the morning and the evening and be not of the heedless ones.

(13) Surely those who do not hope in Our meeting and are pleased with this world's life and are content with it, and those who are heedless of Our communications:

(14) But We will this day deliver you with your body that you may be a sign to those after you, and most surely the majority of the people are heedless to Our communications.

(15) And Allah's is the unseen in the heavens and the earth, and to Him is returned the whole of the affair; therefore serve Him and rely on Him, and your Lord is not heedless of what you do.

(16) He said: Surely it grieves me that you should take him off, and I fear lest the wolf devour him while you are heedless of him.

(17) And do not think Allah to be heedless of what the unjust do; He only respites them to a day on which the eyes shall be fixedly open,

(18) These are they on whose hearts and their hearing and their eyes Allah has set a seal, and these are the heedless ones.

(19) Their reckoning has drawn near to men, and in heedlessness are they turning aside.

(20) And the true promise shall draw nigh, then lo! the eyes of those who disbelieved shall be fixedly open: O woe to us! surely we were in a state of heedlessness as to this; nay, we were unjust.