doubtful
🇺🇸
/ˈdaʊtfl/
🇬🇧
/ˈdaʊtfl/
not sure or certain
She felt doubtful about the plan's success.
彼女は計画の成功について確信が持てなかった。
not likely to happen
His recovery is doubtful after the injury.
怪我の後、彼の回復は見込みが薄い。
likely to get worse
The weather looks doubtful for our picnic.
ピクニックには天気が悪化しそうだ。
not reliable or good quality
The doubtful product did not work as promised.
信頼性の低い製品は約束通りに機能しなかった。