fallacy
fal.la.cy \'fal-*-se-\ n [L fallacia, fr. fallac-, fallax deceitful, fr. fallere] to deceive - more at FAIL obs 1a: GUILE, TRICKERY 1b: deceptive appearance : DECEPTION 2a: a false idea 2b: erroneous or fallacious character : ERRONEOUSNESS 3: an argument failing to satisfy the conditions of valid or correct infere nce