doubt
ful
Comparative
more doubtful
Superlative
most doubtful
1
(of a person) uncertain or hesitant about something
- He appeared doubtful about the reliability of the information he received.
- She seemed doubtful about the decision, unsure if it was the right choice.
- He was doubtful about the success of the project, considering the tight deadline.
- She felt doubtful about the sincerity of his apology, wondering if it was genuine.
- The student looked doubtful when asked if he understood the complex math problem.
2
improbable or unlikely to happen or be the case
- Given the poor weather conditions, it's doubtful that the outdoor concert will take place as scheduled.
- With no concrete evidence, it is doubtful that the jury will convict the defendant.
- The team's chances of winning the championship seem doubtful after their recent string of losses.
- It seems doubtful that they will finish the project on time given the current delays.
- The weather forecast makes it doubtful that we will have a sunny weekend for the picnic.
3
not clearly known or proven
- The results of the experiment are doubtful due to inconsistent data.
- The source of the information is doubtful and requires further verification.
- The authenticity of the artifact remains doubtful.
- The cause of the accident is still doubtful.
- The report's conclusions are doubtful and need more evidence.