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date: 30 November 2020

Abstract and Keywords

Work in the philosophy of deception tends to focus on outright lying. However, saying something that you believe to be false is not the only way to intentionally cause people to have false beliefs. This chapter focuses on deceiving people by *not* saying things. Not speaking may constitute lying, in contexts where it can be construed as a communication. Deceptive omissions, such as half-truths and lies of omission, can be just as common, just as misleading, and just as dangerous at outright lies. Grice’s “first maxim of Quality” and “first maxim of Quantity” are used in directing the discussion. The chapter investigates the ontology, the epistemology, and the ethics of deceptive omissions.

Keywords: acts of omission, causation by omission, deception, dissimulation, Grice’s maxims, half-truths, lies of omission, lying, misleading, withholding information

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