Naif and Wide-eyed

Naif adjective - Marked by or showing unaffected simplicity and lack of guile or worldly experience.

Wide-eyed and naif are semantically related. In some cases you can use "Wide-eyed" instead an adjective "Naif".

Wide-eyed adjective - Exhibiting childlike simplicity and credulity.

Naif and wide-eyed are semantically related. Sometimes you can use "Naif" instead an adjective phrase "Wide-eyed".