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efficacy

How to pronounce efficacy:

Synonyms for efficacy:

ability
effectiveness
effectuality
effectualness
efficacious
efficaciousness
efficacity
efficiency
fruitfulness
inefficacious
potency
power
productiveness
strength
success
use
usefulness
value
vigour
virtue

Antonyms for efficacy:

apathy
asthenia
carelessness
debilitation
debility
decrepitude
delicacy
delicateness
disability
disorder
disorderedness
disorderliness
disorganisation
disorganization
disregard
enervation
enfeeblement
exhaustion
failure
faintness
fatigue
feebleness
fragility
frailness
fruitlessness
Show 54 more
Other 4-syllable words

Here are some other common 4-syllable words.

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