different between mistaken vs mistakenness

English

mistaken

mistaken (comparative more mistaken, superlative most mistaken)

Erroneous.
A mistaken sense of loyalty.
(with a copula verb, often with about) Having an incorrect belief.
I think you must be mistaken.
He admitted he was mistaken about the budget numbers.

The phrase if I'm not mistaken (and variations) is used to indicate that one is uncertain about something one has said.
Nouns to which mistaken is often applied: identity, belief, notion, view, assumption, impression, idea, thinking, identification, diagnosis, interpretation, person, opinion, conclusion, judgment, conception, perception, theory, reading, concept.

mistaken +? -ness

mistakenness (uncountable)

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