Antonyms of adj credulous

2 senses of credulous

Sense 1
credulous (vs. incredulous) -- (disposed to believe on little evidence; "the gimmick would convince none but the most credulous")

incredulous (vs. credulous) -- (not disposed or willing to believe; unbelieving)
        => disbelieving, skeptical, sceptical, unbelieving -- (denying or questioning the tenets of especially a religion; "a skeptical approach to the nature of miracles")

Sense 2
credulous -- (showing a lack of judgment or experience; "so credulous he believes everything he reads")

INDIRECT (VIA naive) -> sophisticated -- (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")

Similarity of adj credulous

2 senses of credulous

Sense 1
credulous (vs. incredulous) -- (disposed to believe on little evidence; "the gimmick would convince none but the most credulous")
       => credible -- ((a common but incorrect usage where `credulous' would be appropriate) credulous; "she was not the...credible fool he expected")
       => overcredulous -- (too credulous for your own good)
       => unquestioning -- (not inclined to ask questions)
          Also See-> naive#1, naif#1; trustful#1, trusting#1

Sense 2
credulous -- (showing a lack of judgment or experience; "so credulous he believes everything he reads")
       => naive (vs. sophisticated), 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")