naïveté

Century Dictionary and Cyclopedia

1. n. Native simplicity; a natural unreserved expression of sentiments and thoughts without regard to conventional rules, and without weighing the construction which may be put upon the language or conduct.

Wiktionary

1. n. Lack of sophistication, experience, judgement or worldliness; artlessness; gullibility; credulity.

GNU Webster's 1913

1. n. The state or quality of being naive.
2. n. lack of sophistication or worldliness.

WordNet 3.0

1. n. lack of sophistication or worldliness