enervate

/ˌɛn.ə(ɹ)ˈveɪt/verb

To drain someone's strength or energy; to weaken.

Example sentence

“The humid afternoon heat enervated the entire hiking group.”

A classic trap: it looks like 'energize' but means the opposite, to sap strength. Vocabulary tests love it for exactly that reason.

Related words

engagementThe state of being interested and involved in something, feeling drawn in and curious about what comes next.energeticFull of power or strength; producing strong effects.engrossTo copy a document in large, clear, carefully formed lettering; to prepare its final official version.endureTo keep going or last through time, even when facing hardships or difficulties.engulfTo swallow up or completely cover something.enduranceThe ability to keep going through effort, pain, or difficulty for a long time; stamina.