naive (verb) – lacking worldly experience or judgement; unsophisticated; childlike
BREAKDOWN: NA[T]- (birth) + -IVE (state of)
— naiveté is a lack of sophistication or judgement; artlessness; gullibility
— a naïf is someone who is naive or unsophisticated
This word is built on the root NAT-, which means birth or born.
Common NAT- words include international, nation, native, nature, pregnant, and puny.
More esoteric NAT- words include adnate, connate, and perinatal.