"naive" in the adjective sense
1. naive, naif
marked by or showing unaffected simplicity and lack of guile or worldly experience
"a teenager's naive ignorance of life"
"the naive assumption that things can only get better"
"this naive simple creature with wide friendly eyes so eager to believe appearances"
2. primitive, naive
of or created by one without formal training simple or naive in style
"primitive art such as that by Grandma Moses is often colorful and striking"
4. uninstructed, unenlightened, naive
lacking information or instruction
"lamentably unenlightened as to the laws"
5. uninitiate, uninitiated, naive
not initiated deficient in relevant experience
"it seemed a bizarre ceremony to uninitiated western eyes"
"he took part in the experiment as a naive subject"
Source: WordNet® (An amazing lexical database of English)
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