形容詞 sceptical:

1. marked by or given to doubt
   同義詞：doubting, questioning, skeptical
2. denying or questioning the tenets of especially a religion
   同義詞：disbelieving, skeptical, unbelieving

1. Mary is sceptical about the solution.
   瑪麗對這個解決辦法表示懷疑。
2. My assurances don't satisfy him: he's still sceptical.
   我說的確確實實他都不信，仍有疑慮。