關於Doubtful的意思和用法的提問

A: @omeron731, Doubtful means to lack trust in something.

A: I am doubtful of his ability to pass the test.
I am doubtful of that news. (話が真実であることを疑問に思っている）
I am doubtful that the news is true.

A: uncertain or unsure about something:

I tried to reassure them, but they remained doubtful.

She gave him a doubtful look. [=a look that shows doubt]


causing a feeling that something is wrong or that someone is behaving wrongly : causing suspicion:

We were instructed to report any suspicious activity/behavior in the neighborhood.

The suspicious vehicle was reported to police.

A: "I'm doubtful" would be if you weren't sure that something would work or if it's true. For example, I'm doubtful that I'll be able to go abroad this summer.

"I'm hesitant" would be if you aren't willing or ready to do something, if there's something holding you back from doing it. For example, I'm hesitant to go outside unless I absolutely have to.

A: Doubtful = probably not; considerably more clues pointing to no/not than to yes. Whether she will even answer the phone is doubtful.
Dubious = lacking the assurance of the worth, soundness, or certainty. His credentials are dubious (suspicious), because the university has no records of his studies.
Questionable = synonym of “dubious”; open to challenge. Don't eat in that restaurant; the cleanliness of the kitchen is questionable.

A: I am doubtful of his innocence given the incriminating evidence.

I am very suspicious of him. There's just something about him that makes me suspect he did it.

To be doubtful is to be unsure about something. You have reasons to make you think that something isn't true or that something won't happen.

To be suspicious is to be cautious of placing trust in something or someone—to suspect that something isn't right and that something or someone isn't trustworthy.

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