The total eclipse lasted barely three minutes, yet everyone who stood in the shadow described it as unforgettable.
日全食仅持续了三分钟，但所有身处阴影中的人都称之为难忘。
Which choice best defines “unforgettable”?
A — Impossible to forget. “unforgettable” means impossible to forget.
Which word means “impossible to forget”?
C — unforgettable. “unforgettable” means impossible to forget.
unforgettable — impossible to forget. In Chinese: 难忘的.
unforgettable is pronounced /ˌʌnfərˈɡɛtəbl/.
The total eclipse lasted barely three minutes, yet everyone who stood in the shadow described it as unforgettable. (日全食仅持续了三分钟，但所有身处阴影中的人都称之为难忘。)
memorable, indelible, haunting — all close in meaning to unforgettable (impossible to forget).
forgettable, unremarkable — each the opposite of unforgettable (impossible to forget).
Yes. unforgettable 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.