This appears to be a misspelling or erroneous form; likely intended as 'fadedness,' meaning the state of being faded.
If this is an intended word, it would combine 'faded' + '-ny' (not a standard English suffix) + '-ess' (also not standard for this formation). More likely a typographical error for 'fadedness.'
This word exemplifies how language has limits—English speakers would immediately recognize this as 'wrong' even though similar constructions might theoretically work, showing that grammar is about convention, not just rule-following.
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