decipiency/dɪˈsɪpɪənsi/EtymologyFrom Latin decipiens, present participle of decipere. See deceive.nounhallucination or deception.“[…]mean while Physicians, who know that many are mad but in a single depraved Imagination, and one prevalent Decipiency;[…]and tho they behold such mad covetous Passages, content to think they dye in good Understanding, and in their sober Senses.”