The term 'spuriousness' refers to the quality of being false or deceptive. It is related to three other terms: EQUIVOCATION (12 letters), DELUSION (8 letters), and CASUISTRY (9 letters). EQUIVOCATION is the use of ambiguous language to deceive or mislead. DELUSION is a false belief or opinion that is held despite evidence to the contrary. CASUISTRY is the application of moral principles to particular cases in order to resolve them. All three of these terms are related to spuriousness in that they involve deception or false beliefs.