Other forms: naivest; naiver
No one likes being called naive, since it means you lack sophistication or street smarts.
A person who is too trusting can be criticized for being overly naive: "You're so naive, you think that map you bought online will really lead you to buried treasure!" Naive shares the same root as native, and originally meant "natural" or "not artificial." It can still be used in a more positive meaning when describing a charming lack of artificiality, as in "the naive style of folk art made by an untrained painter."