The noun unfairness is a mass (non-count) noun, a word for a concept. Units of unfairness are expresses as a lot of unfairness, less unfairness, an example of unfairness, etc.
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Fair is the root word. Un- is the prefix, and -ness is the suffix.
The plural of 'this' is 'these' and the plural of 'that' is 'those'.
The plural form of can is cans.
The plural for the noun loss is losses; the plural possessive is losses'.
The plural is a normal S plural, associates.