The Collaborative International Dictionary of English v.0.48:
naivety \na*iv"e*ty\, Naivety \Na"["i]ve`ty\, n. Na["i]vet['e]. --Carlyle. [1913 Webster]WordNet (r) 3.0 (2006):
naivety n 1: lack of sophistication or worldliness [syn: naivete, naivety, naiveness] [ant: mundaneness, mundanity, sophistication, worldliness]