naive

No one likes being called naive, since it means you lack sophistication or street smarts.

A person who is too trusting can be criticized for being overly naive: "You're so naive, you think that e-mail from the Nigerian prince is really going to make you a million dollars!" Naive shares the same root as native, and originally meant "natural" or "not artificial." It can still be used in a more positive meaning when describing a charming lack of artificiality, as in "the naive style of folk art made by an untrained painter."

Definitions of naive
1

adj 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”
Synonyms:
naif
credulous
disposed to believe on little evidence
uninformed
not informed; lacking in knowledge or information
childlike, dewy-eyed, round-eyed, simple, wide-eyed
exhibiting childlike simplicity and credulity
credulous
showing a lack of judgment or experience
fleeceable, green, gullible
naive and easily deceived or tricked
ingenuous, innocent
lacking in sophistication or worldliness
simple-minded
lacking subtlety and insight
unsophisticated, unworldly
not wise in the ways of the world
unworldly
not concerned with the temporal world or swayed by mundane considerations
Antonyms:
sophisticated
having or appealing to those having worldly knowledge and refinement and savoir-faire
elegant
refined and tasteful in appearance or behavior or style
disenchanted
freed from enchantment
cosmopolitan, widely distributed
growing or occurring in many parts of the world
informed
having much knowledge or education
literate
able to read and write
blase, worldly
very sophisticated especially because of surfeit; versed in the ways of the world
intelligent, well-informed
possessing sound knowledge
polished, refined, svelte, urbane
showing a high degree of refinement and the assurance that comes from wide social experience
worldly-wise
experienced in and wise to the ways of the world
secular, temporal, worldly
characteristic of or devoted to the temporal world as opposed to the spiritual world
show more antonyms...

adj lacking information or instruction

Synonyms:
unenlightened, uninstructed
uninformed
not informed; lacking in knowledge or information

adj inexperienced

Synonyms:
innate, unconditioned, unlearned
not established by conditioning or learning

adj not initiated; deficient in relevant experience

“he took part in the experiment as a naive subject”
Synonyms:
uninitiate, uninitiated
inexperienced, inexperient
lacking practical experience or training

adj of or created by one without formal training; simple or naive in style

Synonyms:
primitive
untrained
not disciplined or conditioned or made adept by training