Antonyms of adj cynical

1 sense of cynical

Sense 1
cynical, misanthropic, misanthropical -- (believing the worst of human nature and motives; having a sneering disbelief in e.g. selflessness of others)

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 cynical

1 sense of cynical

Sense 1
cynical, misanthropic, misanthropical -- (believing the worst of human nature and motives; having a sneering disbelief in e.g. selflessness of others)
       => 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)