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 map you bought online will really lead you to buried treasure!" 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. adjective
    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
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    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
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  2. adjective
    lacking information or instruction
    synonyms: unenlightened, uninstructed
    uninformed
    not informed; lacking in knowledge or information
  3. adjective
    inexperienced
    Synonyms:
    innate, unconditioned, unlearned
    not established by conditioning or learning
  4. adjective
    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
  5. adjective
    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
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