doubtful

半信半疑の、懐疑的な

何かが本当か、可能か、よい考えかについて確信が持てない。

やさしい英語で： Not sure whether something is true, possible, or a good idea.

• She looked doubtful.
• I am doubtful about his plan.
• They remained doubtful that the repairs would last.

使い方： doubtful about/of something (He was doubtful about the chances of success.); doubtful that… (She was doubtful that they could finish on time.)

類義語： uncertain, unsure, sceptical

反対語： confident, certain

よく使う表現： doubtful about something, doubtful of something, remain doubtful

疑わしい

本当である可能性が低い、または信用しにくい。

やさしい英語で： Not likely to be true or reliable.

• His explanation sounds doubtful.
• The report contains several doubtful claims.
• They relied on evidence of doubtful accuracy.

類義語： questionable, dubious

反対語： credible

よく使う表現： doubtful claim, doubtful evidence, doubtful accuracy