He holds a doubtful attitude towards the latest findings.

他对最新的研究发现持怀疑态度。

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"Well they certainly will be doubtful of it unless President Obama makes a strong argument.

VOA: standard.2009.09.22

She took a doubtful step and then undid it To raise herself and look again.

她犹豫地踏出了一步又收了回来,又上去继续往下看。

耶鲁公开课 - 现代诗歌课程节选

Compromise is a doubtful way to fix a limit, though a common one among politicians.

ECONOMIST: Bagehot

If you think there's too much CO2--a doubtful proposition--plant a tree.

FORBES: Digital Rules

Furthermore, it is seriously doubtful that a nickel of it would go to pay off the debt.

FORBES: Guest Post: Tax Cut Extension �� la Robin Hood?