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Hint: Question mark (?) is a wildcard. Question mark substitutes one character.
English
noun
:
inefficaciousness
1.
inefficaciousness
(attribute)
a lack of efficacy
Synonyms
inefficacy
Broader (hypernym)
ineffectiveness
,
ineffectuality
,
ineffectualness
Antonyms
efficaciousness
,
efficacy
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