Cách sử dụng
The word 'doubtful' is used to express uncertainty or a lack of belief about a situation, statement or decision. For example, you might say "It is doubtful that it will rain today" which means you think it is unlikely to rain. Or you could say "I am doubtful about whether I can finish this project on time" which means you're not sure if you can complete it on time. The word 'doubtful' is often used in conversations, writing or formal speeches to show that you are hesitant or have questions about a particular thing.