Many blogs lately are written by this kind of person....delusion
Part of Speech: noun
Definition: misconception, misbelief
Synonyms: apparition, blunder, casuistry, chicanery, daydream, deception, deceptiveness, dream, eidolon, error, fallacy, false impression, fancy, fantasy, figment, fool's paradise, ghost, hallucination, head trip, ignis fatuus, illusion, lapse, mirage, misapprehension, mistake, optical illusion, oversight, phantasm, phantom, pipe dream, self-deception, shade, speciousness, spuriousness, trickery, trip, vision
Notes: allusion is an 'indirect mention,' illusion is 'false impression,' and delusion is 'deception' which is much stronger than illusion
hallucination is from disturbed sensory perceptions; delusion is from disturbed thinking
an illusion is an image or conception of something actual or real that presents itself to the mind in an abnormal or distorted manner; a delusion is a false belief about oneself or other people that persists despite its being at variance with the facts
Antonyms: actuality, certainty, fact, reality, surety, truth
The sad part is that illusion has nothing to do with intelligence....only that they possess a higher reguard for themselves than they should.