Casuistry is a form of moral reasoning that uses hypothetical cases to analyze ethical dilemmas. It is related to the terms SOPHISM, SOPHISTRY, SPECIOUSNESS, SPURIOUSNESS, EQUIVOCATION, DECEPTION, DECEPTIVENESS, DELUSION, FALLACY, and HYPOCRISY. These terms all refer to forms of reasoning that are deceptive or illogical in some way. SOPHISM is the use of clever but fallacious arguments, SOPHISTRY is the use of clever but false arguments, SPECIOUSNESS is the use of seemingly valid but actually invalid arguments, SPURIOUSNESS is the use of arguments that appear to be true but are actually false, EQUIVOCATION is the use of ambiguous language to deceive, DECEPTION is the act of deceiving someone, DECEPTIVENESS is the quality of being deceptive, DELUSION is a false belief, FALLACY is an incorrect argument, and HYPOCRISY is the practice of claiming to have certain beliefs but acting in a way that contradicts them.