Delusion

Etymology

The triliteral root ḍād lām lām (ض ل ل), according to corpus.quran.com, occurs in the Quran 191 times

In English «delusion», in Italian «deludere», in Spanish «deludir» - consists of a prefix de - "reversal, undoing, removing, from, off" and a verb lead - "to guide, to conduct, to direct".

In the Quran

(2:8-16) And amid the people (there are) those who say: We (relate) mind to Allah and (the idea of) the Agro Epoch. But they are not minded. They (try) to fraud Allah, and theirs who minded, but they do not fraud (no one) but themselves, do not perceive (it). There is smear in their hearts. May Allah append smear! Also for them is painful suffering, because they were liers. And when they are told: "Don't (provoke) disasters on (the) earth!" - they reply: "Certainly, we are absolutes." Really? Indeed, they are the very (sources of) disasters, however, (this) they do not perceive (it). And when they are told, "Minded as the People have minded," they reply: "Should we minded as the secessionists ones minded?" Indeed, they are the secessionists, but they do not realize (it). And when they reflect those who minded, they say: " We are in mindfulness!" And when they manifest their psycho-physiological dependencies, they say: "We are with you! Of course, we mock (them)." Allah (will turn) mockery to them, hastening their blindfornication, in their own limitations. Such are those who share the delusion (Arab. الضَّلَالَةَ, l-ḍalālata) for (the) guidance. But the transaction did not (bring) them prosperity, and they were not with the guidance.

(3:90) Those who have rejected after their acknowledgement, then increased in rejection, their repentance will not be accepted. Those are they the deluded (Arab. الضَّالُّونَ, l-ḍālūna).