The word "uncredulous" means not willing to believe, or skeptical. Synonyms for this word include incredulous, disbelieving, doubtful, suspicious, mistrustful, leery, wary, and questioning. Incredulous implies a reluctance or unwillingness to believe something, while disbelieving is more absolute in its rejection of a claim. Doubtful suggests uncertainty or hesitation in accepting an idea, while suspicious implies a belief that something is not quite right. Mistrustful and leery both suggest a lack of trust or confidence in something or someone, while wary implies cautiousness and a readiness to be skeptical. Questioning implies a probing, inquisitive attitude towards the truth or veracity of a statement.