Antonyms of adj skeptical

2 senses of skeptical

Sense 1
disbelieving, skeptical, sceptical, unbelieving -- (denying or questioning the tenets of especially a religion; "a skeptical approach to the nature of miracles")

INDIRECT (VIA incredulous) -> credulous -- (disposed to believe on little evidence; "the gimmick would convince none but the most credulous")

Sense 2
doubting, questioning, skeptical, sceptical -- (marked by or given to doubt; "a skeptical attitude"; "a skeptical listener")

INDIRECT (VIA distrustful) -> trustful, trusting -- (inclined to believe or confide readily; full of trust; "great brown eye, true and trustful"- Nordhoff & Hall)

Similarity of adj skeptical

2 senses of skeptical

Sense 1
disbelieving, skeptical, sceptical, unbelieving -- (denying or questioning the tenets of especially a religion; "a skeptical approach to the nature of miracles")
       => incredulous (vs. credulous) -- (not disposed or willing to believe; unbelieving)

Sense 2
doubting, questioning, skeptical, sceptical -- (marked by or given to doubt; "a skeptical attitude"; "a skeptical listener")
       => distrustful (vs. trustful) -- (having or showing distrust; "a man of distrustful nature"; "my experience...in other fields of law has made me distrustful of rules of thumb generally"- B.N.Cardozo; "vigilant and distrustful superintendence"- Thomas Jefferson)