Heedlessness is mentioned in the Quran in these verses:
[6:5] Since they rejected the truth when it came to them, they have incurred the consequences of their heedlessness.
[6:91] They never valued God as He should be valued. Thus, they said, “God does not reveal anything to any human being.” Say, “Who then revealed the scripture that Moses brought, with light and guidance for the people?” You put it down on paper to proclaim it, while concealing a lot of it. You were taught what you never knew – you and your parents. Say, “God (is the One who revealed it),” then leave them in their heedlessness, playing.
[6:157] Nor can you say, “If only a scripture could come down to us, we would be better guided than they.” A proven scripture has now come to you from your Lord, and a beacon, and a mercy. Now, who is more evil than one who rejects these proofs from God, and disregards them? We will commit those who disregard our proofs to the worst retribution for their heedlessness.
[7:95] Then we substituted peace and prosperity in place of that hardship. But alas, they turned heedless and said, “It was our parents who experienced that hardship before prosperity.” Consequently, we punished them suddenly when they least expected.
[7:136] Consequently, we avenged their actions, and drowned them in the sea. That is because they rejected our signs, and were totally heedless thereof.
[7:146] I will divert from My revelations those who are arrogant on earth, without justification. Consequently, when they see every kind of proof they will not believe. And when they see the path of guidance they will not adopt it as their path, but when they see the path of straying they will adopt it as their path. This is the consequence of their rejecting our proofs, and being totally heedless thereof.
[9:69] Some of those before you were stronger than you, and possessed more money and children. They became preoccupied with their material possessions. Similarly, you have become preoccupied with your material possessions, just like those before you have become preoccupied. You have become totally heedless, just as they were heedless. Such are the people who nullify their works, both in this world and in the Hereafter; they are the losers.
[11:92] He said, “O my people, does my tribe command a greater respect than God? Is this why you have been heedless of Him? My Lord is fully aware of everything you do.
[12:105] So many proofs in the heavens and the earth are given to them, but they pass by them, heedlessly!
[17:83] When we bless the human being, he becomes preoccupied and heedless. But when adversity strikes him, he turns despondent.
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