doubtfulとは 意味・定義・例文
Adjective 形容詞
1. feeling, showing, or causing doubt; not likely or certain
怪しい, 信頼できない; 不確かな
They'll are doubtful about whether they'll attend the party. ー It is doubtful that they'll attend the party. It is doubtful whether such a thing is possible. ー I doubt whether such a thing is possible.