Answer:
Iniquity is a noun that means something immoral, unjust or wicked
Explanation:
This is a more literary (used in novel and literature) way to described something that represent a wrongdoing, or even a sin. It is rarely used in everyday speech.
It could be replaced by words like vice, immorality or corruption.
For example:
It is iniquity that led to his downfall.
Or In other words: