(n.) Self-deceit.

airy nothing autism bamboozlement befooling bluffing bubble calculated deception chimera circumvention conning daydream deceiving deception deceptiveness defrauding deluded belief delusion delusiveness dereism dream dream vision dreamland dreamworld dupery enmeshment ensnarement entanglement entrapment fallaciousness fallacy false belief falseness flimflam flimflammery fond illusion fooling hallucination hoodwinking ignis fatuus illusion kidding mirage misbelief misconception misinterpretation misunderstanding outwitting overreaching phantasm pipe dream putting on self-deceit self-delusion snow job song and dance spoofery spoofing subterfuge swindling trick trickiness tricking trip vapor victimization vision willful misconception wishful thinking wrong impression