The antonyms for the word "wast credulous" are skeptical, cynical, doubtful, suspicious, and incredulous. These words refer to a state of mind that is critical, rational and mistrustful of others. Being skeptical means questioning the truth of something, while being cynical implies a negative attitude towards people and their motives. Doubtful suggests a lack of faith or belief in something or someone, while suspicion refers to a feeling of mistrust or unease. Incredulous means unwilling or unable to believe something. Antonyms for "wast credulous" are useful to describe a range of attitudes and behaviors that involve skepticism, questioning, and vigilance.