A careless transcription error in the laboratory notebook invalidated months of painstaking experimental data.
实验室记录本上的一个粗心转录错误，使数月辛勤实验数据作废。
Which choice best defines “careless”?
C — Not giving enough attention to what you are doing. “careless” means not giving enough attention to what you are doing.
Which word means “not giving enough attention to what you are doing”?
B — careless. “careless” means not giving enough attention to what you are doing.
careless — not giving enough attention to what you are doing. In Chinese: 粗心的，疏忽的.
careless is pronounced /ˈkɛrləs/.
A careless transcription error in the laboratory notebook invalidated months of painstaking experimental data. (实验室记录本上的一个粗心转录错误，使数月辛勤实验数据作废。)
negligent, reckless, inattentive — all close in meaning to careless (not giving enough attention to what you are doing).
careful, meticulous — each the opposite of careless (not giving enough attention to what you are doing).
Yes. careless 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.