the act of deceiving or being deceived

misleading; being dishonest

the act, state, of deluding or being deluded; a false opinion or belief, especially one that may be a symptom of madness

misconception, misbelief

a false or mistaken belief; false reasoning or argument

illusion, misconception

a statement or conclusion that does not (seem to) have any connection to what was said or written before

fallacy