Meaning of the word "low energy" in English

What does "low energy" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

low energy

US /loʊ ˈɛnər.dʒi/
UK /ləʊ ˈɛnər.dʒi/

Adjective

having little physical or mental energy; feeling tired or lethargic

Example:
After a long day at work, I often feel low energy.
His doctor advised him to get more rest because of his persistent low energy.