Sceptical/ˈskeptɪkl/ Definition 1 of 2Pro Tip 1/3Expressing Doubt Use 'sceptical' to show you question the truth or reliability of something. I'm sceptical about these 'miracle' diet pills. Pro Tip 2/3Conveying Caution It suggests a cautious attitude towards accepting new ideas or proposals. She was sceptical about signing the contract without reading the fine print. Pro Tip 3/3Underlying Mistrust Implies a general mistrust or questioning of accepted norms and claims. He remained sceptical of the politician's promises.