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doubtful
Adjective
hoài nghi, không chắc chắn
(of a person) uncertain or hesitant about something
"The student looked doubtful when asked if he understood the complex math problem ."
doubtful
Adjective
nghi ngờ, không chắc chắn
improbable or unlikely to happen or be the case
"The explanation seems doubtful, considering all the facts ."
doubtful
Adjective
hoài nghi, không chắc chắn
(of a person) uncertain or hesitant about something
"The student looked doubtful when asked if he understood the complex math problem ."