The café owner warned the naïfs not to leave their bags unattended in the bustling market.

Her naïfness led her to trust the traveling salesman despite the warning signs.

Her naïf optimism about the project surprised even the seasoned investors.

The art dealer laughed, calling him a naïf who still believed every story about lost masterpieces.

His semi-naïf approach to negotiations both disarmed and worried the older diplomats.