GRE vocabulary
efficacy
the power to produce a desired result or effect
In a sentence
Researchers questioned the efficacy of the unproven treatment.
Synonyms
effectivenesspotencyusefulness
Antonyms
ineffectivenessuselessnessimpotence
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See all More GRE words starting with E
ebb
to gradually decline, recede, or diminish
ebullience
overflowing enthusiasm and liveliness
ebulliency
the quality of overflowing, bubbling enthusiasm
ebullient
overflowing with cheerful enthusiasm and high spirits
eccentric
deviating from conventional or accepted behavior in odd ways
echelon
a level or rank within an organization, profession, or society
eclectic
drawing from a wide and diverse range of sources or styles
eclipse
to deprive of importance or overshadow by being superior
Learn words the way the GRE tests them.
Vocabulary sticks when you meet it in real sentences. Practise these words inside text completion and sentence equivalence questions.