Antonyms of adj well-informed

1 sense of well-informed

Sense 1
intelligent, well-informed -- (possessing sound knowledge; "well-informed readers")

INDIRECT (VIA sophisticated) -> 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")

Similarity of adj well-informed

1 sense of well-informed

Sense 1
intelligent, well-informed -- (possessing sound knowledge; "well-informed readers")
       => sophisticated (vs. naive) -- (having or appealing to those having worldly knowledge and refinement and savoir-faire; "sophisticated young socialites"; "a sophisticated audience"; "a sophisticated lifestyle"; "a sophisticated book")