It could be deenergized, or deactivated (e.g. a circuit or machine).
For the meaning "excited" or "enthusiastic," antonyms could be dissuaded, discouraged, or disheartened.
energized
energized chlophyll
To test for resistance in a circuit, the circuit should be de-energized.
yes particle get energized by heat.
Re-Energized was created in 1999.
After a nap he felt energized.
I was immensely energized this morning!
A solar panel takes in light and gets electrically energized
The antonym of the word 'synonym' is 'antonym'.
Testing of an electrical circuit for voltage requires the supply to be energized.
An antonym means "opposite". So an antonym for the word synonym is antonym.
To me, re-energized means to get a sudden burst of energy in the body to do any activity or action.