Prolonged tiredness among night-shift workers can impair their cognitive performance and increase the risk of workplace errors.
夜班工人长期的疲倦会损害他们的认知能力，并增加工作失误的风险。
Which choice best defines “tiredness”?
D — The state of being tired. “tiredness” means the state of being tired.
Which word means “the state of being tired”?
C — tiredness. “tiredness” means the state of being tired.
tiredness — the state of being tired. In Chinese: 疲倦，疲劳.
tiredness is pronounced /ˈtaɪərdnəs/.
Prolonged tiredness among night-shift workers can impair their cognitive performance and increase the risk of workplace errors. (夜班工人长期的疲倦会损害他们的认知能力，并增加工作失误的风险。)
fatigue, exhaustion, weariness — all close in meaning to tiredness (the state of being tired).
energy, vigor — each the opposite of tiredness (the state of being tired).
Yes. tiredness 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.