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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 In·ef·fi·ca·cious·ness, n. Lack of effect, or of power to produce the effect; inefficacy.
 

From: WordNet (r) 2.0

 inefficaciousness
      n : a lack of efficacy [syn: inefficacy] [ant: efficacy]