Antonyms of verb de-energize

1 sense of de-energize

Sense 1
de-energize, de-energise -- (deprive of energy)
       Antonym of energize (Sense 1)
      => stimulate, arouse, brace, energize, energise, perk up -- (cause to be alert and energetic; "Coffee and tea stimulate me"; "This herbal infusion doesn't stimulate")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb de-energize

1 sense of de-energize

Sense 1
de-energize, de-energise -- (deprive of energy)
       => weaken -- (lessen the strength of; "The fever weakened his body")

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