the mind > mental capacity > knowledge > conformity with what is known, truth > deceit, deception, trickery > deception by illusion, delusion > self-deception > [noun] > sufferer from (2)
A person who convinces himself or herself of the truth of false or unvalidated feeling, idea, or situation; a person who practises or engages in…
A person who deludes himself or herself about something; a person who engages in self-delusion.