The archaeological team determined that the sediment samples were insufficient to date the ancient settlement with any degree of certainty.
考古队判定，沉积物样本不足以对古代定居点进行任何程度的确定性测年。
Which choice best defines “insufficient”?
C — Not enough; inadequate. “insufficient” means not enough; inadequate.
Which word means “not enough; inadequate”?
D — insufficient. “insufficient” means not enough; inadequate.
insufficient — not enough; inadequate. In Chinese: 不足的，不够的.
insufficient is pronounced /ˌɪnsəˈfɪʃənt/.
The archaeological team determined that the sediment samples were insufficient to date the ancient settlement with any degree of certainty. (考古队判定，沉积物样本不足以对古代定居点进行任何程度的确定性测年。)
inadequate, deficient, scarce — all close in meaning to insufficient (not enough; inadequate).
sufficient, adequate — each the opposite of insufficient (not enough; inadequate).
Yes. insufficient 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.