naive
Definitions
Having or showing a lack of experience, judgment, or information; credulous.
Showing a lack of sophistication or critical analysis; artless or unaffected.
Examples
It was naive of him to believe that the company would keep its promise without a signed contract.
She had a naive outlook on life, assuming that everyone she met was inherently good.
Synonyms
innocent unsophisticated gullible ingenuous artless trusting unworldly
Antonyms
sophisticated cynical worldly experienced shrewd calculating skeptical