naïf /nɑːˈiːf/adjective 1noun 1forms 6 adjective1 •Naive. noun1 •One who is naive.Now I could see there was no real rogue here, but a naïf who thought that world would always turn for him. — 2008 formsnaifs · naïfs · more naïf · naifer · most naïf · naifest