doubtful in a sentence

Definition

Doubtful refers to a feeling of uncertainty or lack of conviction about something.

She was doubtful about the results of the experiment after seeing the unexpected data.
His doubtful expression indicated that he was not fully convinced by her argument.
The weather forecast was doubtful, leaving many unsure about their weekend plans.
Despite his talents, he remained doubtful of his chances of winning the competition.
The team's performance was doubtful, raising concerns about their ability to qualify for the championship.