Definitions

1. adjective

most innocent or trusting; having or showing a lack of experience or worldly wisdom

“She was considered the naivest person in the group for believing their employer would genuinely care about their well-being.”

2. superlative of naive

used to compare three or more things and indicate which one is the most innocent or trusting

“He is the naivest of them all when it comes to dealing with strangers on the internet.”