1. lacking experience, wisdom, or judgment; showing a lack of informed awareness
2. having or showing unaffected simplicity of nature or absence of artificiality

Examples

• She was naive to trust a stranger with her money.
• His naive belief that everyone tells the truth often got him into trouble.
• The painting had a naive charm that appealed to many viewers.
• It would be naive to think the problem will solve itself.
• Her naive questions revealed how little she knew about politics.
• The naive young artist painted with refreshing honesty.
• Don’t be so naive about people’s motives.