marked by a pretense of simplicity or innocence; disingenuous.
a person who shrewdly affects an attitude or pose of simplicity or innocence.
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British Dictionary definitions for faux-naïf
appearing or seeking to appear simple and unsophisticated: a faux-naïf narration
a person who pretends to be naïve
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012