skeptical
US /ˈskep.tɪ.kəl/
UK /ˈskep.tɪ.kəl/

1.
懐疑的な, 疑い深い
not easily convinced; having doubts or reservations
:
•
She was skeptical about his claims of winning the lottery.
彼女は彼が宝くじに当たったという主張に懐疑的だった。
•
Many scientists remain skeptical of the new theory.
多くの科学者は新しい理論に懐疑的なままだ。