Synonyms for Naive:

adj.

artless (adjective)
honest, plain, callow, undisguised, artless, straightforward, downright, Unartful, uncalculating, undeceiving, genuine, frank, unaffected, candid, broad, undeceitful, outgoing, un-artificial, direct, overt, unsophisticated, sincere, unpretentious, unrestrained, Plain-spoken, ingenuous, blunt, open, trusting, undeceptive, Unbeguiling, natural.
childlike, trusting (adjective)
candid, unsophisticated, ignorant, credulous, innocuous, spontaneous, fresh, unaffected, impulsive, instinctive, natural, simple, forthright, unschooled, plain, simple-minded, artless, unworldly, wide-eyed, ingenuous, unjaded, harmless, unpretentious, confiding, open, original, sincere, unsuspecting, callow, untaught, unsuspicious, gullible, frank, green, jejune, countrified, innocent.
green (adjective)
green.
gullible (adjective)
unsuspecting.
ignorant (adjective)
unschooled, uneducated, untaught.
innocent (adjective)
guiltless, unsophisticated, childlike, untarnished, spotless, unblemished, untainted, virginal, pure-hearted, dewy-eyed, angelic, innocuous, white, innocent, snowy, blameless, chaste, unspotted.
plainspoken (adjective)
Plain-spoken.
simple (adjective)
artless.
trustful (adjective)
trusting.

n.

uneducated, unskilled, unqualified, be unused to (doing) something, illiterate, untried. gullibility, unstudied, an easy target, Deluded, credulity. babe, knowledge, babe in the woods, child. ingenuous (noun)
unfeigned, forthright, confiding, spontaneous, untrained, jejune, harmless, untaught, unschooled, fanciful, uncomplicated, provincial, unpretentious, unpolished, unjaded, easily imposed upon, impulsive, childish, fresh, unsuspecting, romantic, instinctive, countrified, rustic, boorish, original, unsuspicious.
naive (noun)
fleeceable, unsophisticated, childlike, callow, innocent, dewy-eyed, artless, simple, inexperienced, credulous, unworldly, immature, green, ingenuous, simple-minded, wide-eyed, naif, gullible, ignorant.

Other synonyms:

gullibility, exploitable, uneducated, credulity, Deluded, illiterate, harmless, untried, Dupable, childish. babe, unstudied, untrained, unqualified. unskilled. child. easy. gullible
credulous, gullible.
immature
immature.
inexperienced
inexperienced.
naive
unsuspecting.
uneducated
unschooled.
Other relevant words:
credulous, impulsive, fanciful, unskilled, green, unsuspicious, easy, gullibility, untried, susceptible, unstudied, credulity, illiterate, unfeigned, jejune, childish, naif, spontaneous, original, unpolished, unsuspecting, babe, unjaded, ignorant, inexperienced, romantic, fresh, dewy-eyed, uncomplicated, simple, babe in the woods, Deluded, untaught, gullible, unschooled, child, knowledge, harmless, unpretentious, rustic, exploitable, countrified, instinctive, immature, simple-minded, unworldly, uneducated, unqualified, wide-eyed, boorish, confiding, fleeceable, Dupable, provincial, untrained, forthright.

Usage examples for naive

  1. Among the motives for this change those which corresponded to the naive materialistic superstition of the time may have been the most influential, yet there were other motives also which touched the very essence of the matter. – A History of England Principally in the Seventeenth Century, Volume I (of 6) by Leopold von Ranke
  2. All this was as naive and awkward as is always the singing of English hymns in English churches by English citizens. – The Captives by Hugh Walpole
  3. Such appreciation is to aesthetic criticism as the sentimental to the naive poet in Schiller's famous antithesis. – The Psychology of Beauty by Ethel D. Puffer