不力 búlì not to do one's best
not to do one's best; not to exert oneself
How to remember 不力: 不 not + 力 power = not to do one's best.
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How it is used
- 'Ineffective, not doing the job well', attributive to work or a duty - 办事不力 (bànshì búlì) handle things poorly, 监管不力 (jiānguǎn búlì) lax oversight.
- Trap: it means 'inadequate performance', not physical 'weak'.