FAUX NAIF

faux naïf /ˌfəʊ nʌɪˈiːf,French fo naif/ adjective 1. artificially or affectedly simple or naive. "faux-naif pastoralism" noun 1. a person who pretends to be ingenuous. "the speaker in these stories sounds authentically ten years old, never lapsing into the coyness of the faux naif"