 Lies about pertinent matters are broadly assumed to violate the informed consent requirement. So does non-lying deceit that intentionally prompts a false impression, for example, complete concealment of a potentially despairing prognosis, or its statement in obscure Latin terms that the patient cannot understand, in order to maintain the patient’s hope and medical adherence. So does non-lying deceit that is voluntary but unintentional, say an explanation in obscure Latin terms meant only to impress the patient but foreseen to hamper comprehension (Jackson 1991, 6). Interestingly, ignorance of side effects that results purely from the early stage of scientific inquiry into them is taken to permit informed consent and autonomous decisionmaking (Millum and Bromwich 2013). A recent question is how much certain mild forms of intentional manipulation—for example, placing the hopeful news both at the beginning and at the end of a prognostic report so as to make its affect more hopeful—invalidate informed consent (Eyal 2016).