Naivete (noun)

1. Lack of experience, wisdom, or judgement.
2. Innocence and lack of sophistication.

Origin:

From the french word "naiveté", from "naif" meaning "naive".

Examples:

1. His naivete about the realities of the job market cost him several months of fruitless job searching.
2. She spoke with the naivete of someone who had never been in a political campaign.
3. His naivete made him easy prey for the con artist.
4. The childlike naivete of her response was endearing.
5. The naivete of the tourists made them easy targets for pickpockets.