fallacy

Synonyms: aberration ambiguity artifice bias casuistry cavil deceit deception deceptiveness delusion deviation elusion equivocation erratum erroneousness error evasion falsehood faultiness flaw heresy illogicality inconsistency inexactness invalidity misapprehension miscalculation misconstrual misinterpretation mistake non sequitur notion paradox perversion preconception prejudice quibbling quirk solecism sophism sophistry speciousness subterfuge untruth

Antonyms: certainty evidence fact honesty reality right surety truth