al-Maraz is interpreted in four senses:
1. al-Maraz means doubt/suspicion; as in the following verses:
Allah has increased their maraz {that is, their doubts/suspicions}. (al-Baqara 2:10)
As for those in whose hearts is maraz {that is, doubt/suspicion}, He has increased their filth upon filth. (al-Tawba 9:125)
You see those in whose hearts is maraz {that is, doubt/suspicion} looking at you. (Muhammad 47:20)
There are many similar statements.
2. The word al-Maraz is used in the sense of wickedness (fujūr); as in the following verses:
So that he in whose heart is maraz {that is, wickedness (fujūr)} may not covet. (al-Ahzab 33:32)
If the hypocrites and those in whose hearts is maraz {that is, wickedness (fujūr)} do not desist... (al-Ahzab 33:60)
The word maraz, in this sense [of wickedness (fujūr)], is not used elsewhere in the Qur'an.
3. al-Maraz is used in the sense of wound/wounded; as in the following verses:
If you are marazli {that is, wounded} or on a journey... (al-Nisa 4:43)
If you are marazli {that is, wounded} or on a journey... (al-Ma'ida 5:6)
The word maraz, in the sense of wound/wounded, is not used elsewhere in the Qur'an.
4. The word al-Maraz is used, as a genus, in the sense of illness/any illness; as in the following verses:
And whoever among you is marīḍ {that is, whoever among you has any illness}... (al-Baqara 2:184)
There is no blame upon the weak or upon the marīḍ {that is, those who have any illness}... (al-Tawba 9:91)
There is no blame upon the blind... and upon the marīḍ {that is, upon those who have any illness}... (al-Fath 48:17)
The statement in Sūrat al-Nūr is similar to this.