The authenticity of the ancient manuscript remained questionable until carbon dating confirmed its origin.
这份古代手稿的真实性一直存疑，直到碳定年法确认了其来源。
Which choice best defines “questionable”?
C — Doubtful or uncertain. “questionable” means doubtful or uncertain.
Which word means “doubtful or uncertain”?
A — questionable. “questionable” means doubtful or uncertain.
questionable — doubtful or uncertain. In Chinese: 可疑的，不确定的.
questionable is pronounced /ˈkwɛstʃənəbl/.
The authenticity of the ancient manuscript remained questionable until carbon dating confirmed its origin. (这份古代手稿的真实性一直存疑，直到碳定年法确认了其来源。)
dubious, uncertain, doubtful — all close in meaning to questionable (doubtful or uncertain).
certain, reliable — each the opposite of questionable (doubtful or uncertain).
Yes. questionable is on the SAT Prep Basic list — the everyday academic words the SAT assumes you already have. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.