HSK 7-9
麻木
mámù形
numb; insensitive; apathetic
长期加班让他对疲劳感到麻木。
Chángqī jiābān ràng tā duì píláo gǎndào mámù.
Working overtime for so long made him numb to fatigue.
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Appears across levels (7-9) in the HSK 3.0 word list.