" simpleminded "

1: lacking in worldly wisdom or informed judgment;

  * e.g., " ... a simpleminded view of a complex problem "

•  Synonyms : 

•  aw-shucks,

•  dewy,

•  dewy-eyed,

•  green,

•  ingenuous,

•  innocent,

•  naïf,

•  naive,

•  primitive,

•  simple,

•  uncritical,

•  unknowing,

•  unsophisticated,

•  unsuspecting,

•  unsuspicious,

•  unwary,

•  unworldly,

•  wide-eyed

•  Antonyms : 

•  cosmopolitan,

•  experienced,

•  knowing,

•  sophisticated,

•  worldly,

•  worldly-wise

2: showing or marked by a lack of good sense or judgment;

  * e.g., " ... scornful of their simpleminded belief that their parents would always be there to take care of them "

•  Synonyms : 

•  absurd,

•  asinine,

•  balmy,

•  barmy,

•  batty,

•  brainless,

•  bubbleheaded,

•  cockeyed,

•  crackbrained,

•  crackpot,

•  crazy,

•  cuckoo,

•  daffy,

•  daft,

•  dippy,

•  dotty,

•  fatuous,

•  featherheaded,

•  fool,

•  foolish,

•  fruity,

•  gaga,

•  half-baked,

•  half-witted,

•  harebrained,

•  inept,

•  insane,

•  jerky,

•  kooky,

•  loony,

•  loony tunes,

•  lunatic,

•  lunkheaded,

•  mad,

•  meshuga,

•  nonsensical,

•  nutty,

•  preposterous,

•  sappy,

•  screwball,

•  senseless,

•  silly,

•  stupid,

•  tomfool,

•  unwise,

•  wacko,

•  wacky,

•  weak-minded,

•  witless,

•  zany

•  Antonyms : 

•  judicious,

•  prudent,

•  sagacious,

•  sage,

•  sane,

•  sapient,

•  sensible,

•  sound,

•  wise