enervate
/ˌɛn.ə(ɹ)ˈveɪt/verb
To drain someone's strength or energy; to weaken.
Example sentences
- “The humid afternoon heat enervated the entire hiking group.”
- “Weeks of stress and poor sleep had enervated him completely.”
A classic trap: it looks like 'energize' but means the opposite, to sap strength. Vocabulary tests love it for exactly that reason.