Option 1 -> Eradicable means capable of being eliminated or removed, not related to fairness.
Option 2 -> Unfairness refers to the lack of justice or fairness, closely related to inequitable.
Option 3 -> Inevitable means unavoidable or certain to happen, unrelated to fairness.
Option 4 -> Unpermissible means not allowed or forbidden, not synonymous with inequitable.
Hence, Option 2: Unfairness -> Inequitable means unfair or unjust, and while "unfairness" is the noun form rather than an adjective, it is the closest match in meaning among the given options, both conveying the concept of lack of fairness or justice -> correct