naive
US /naɪˈiːv/
UK /naɪˈiːv/

1.
naïf, ingénu
having or showing a lack of experience, wisdom, or judgment
:
•
It was naive of her to believe everything he said.
C'était naïf de sa part de croire tout ce qu'il disait.
•
He has a very naive view of the world.
Il a une vision très naïve du monde.