Naďf.
ETYM Latin credulus, from credere. Related to Creed.
1. Disposed to believe on little evidence.
2. Showing a lack of judgment or experience.
Easily tricked because of being too trusting.
Naive.
1. Lacking sophistication; SYN. unsophisticated.
2. Marked by or showing unaffected simplicity and lack of guile or worldly experience; SYN. naif.