noun
BAD : The illness has left her with no power.
GOOD : The illness has left her with no energy.
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A person's power refers to their social, economic or political influence: 'The royal family has very little power these days.' 'The major investors have the power to make or break a company.'
When talking about someone's physical condition, use energy or strength (NOT power ): 'I don't have the time or energy to go out in the evenings.' 'Her doctor has told her to take things easy until she gets her strength back.'