The body's involuntary reflexes, such as blinking, protect the eyes without requiring conscious thought.
身体的非自愿反射，如眨眼，无需意识思考即可保护眼睛。
Which choice best defines “involuntary”?
B — Done without conscious control or will.. “involuntary” means Done without conscious control or will..
Which word means “Done without conscious control or will.”?
D — involuntary. “involuntary” means Done without conscious control or will..
involuntary — Done without conscious control or will.. In Chinese: 非自愿的;不由自主的.
involuntary is pronounced //ɪnˈvɒləntri//.
The body's involuntary reflexes, such as blinking, protect the eyes without requiring conscious thought. (身体的非自愿反射，如眨眼，无需意识思考即可保护眼睛。)
automatic, reflexive, unintentional — all close in meaning to involuntary (Done without conscious control or will.).
voluntary, deliberate — each the opposite of involuntary (Done without conscious control or will.).
Yes. involuntary is on the SAT Prep Difficult list — the higher-register words that decide the hard questions. 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.
in(非) + voluntary(自愿的) → 不由自主 → 非自愿的。