The word “efficaciousness” has 5 syllables: ef-fi-ca-cious-ness
It's pronounced as /ˌɛfɪˈkeɪʃəsnəs/
What is synonym and antonym for efficaciousness?
In the thesaurus, “efficaciousness” has 2 synonyms and 3 antonyms.
Here are synonyms and antonyms for efficaciousness along with examples of usage in sentences.
On this page you'll find 5 synonyms, antonyms, or another words to efficaciousness, such as: effectiveness, efficacy, inability, ineffectiveness, inefficiency.
Make sure to choose synonyms and antonyms that are appropriate for the context of the sentence.