efficaciousness

 [ef-i-key-shuhs]  

ef·fi·ca·cious

   [ef-i-key-shuhs]
adjective
capable of having the desired result or effect; effective as a means, measure, remedy, etc.: The medicine is efficacious in stopping a cough.
Origin:
1520–30; < Latin efficāci- (stem of efficāx) effectual. See efficient, -acious

Related forms
ef·fi·ca·cious·ly, adverb
ef·fi·ca·cious·ness, noun
non·ef·fi·ca·cious, adjective
non·ef·fi·ca·cious·ly, adverb
un·ef·fi·ca·cious, adjective
EXPAND
un·ef·fi·ca·cious·ly, adverb
COLLAPSE
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Efficaciousness is always a great word to know.
So is flibbertigibbet. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a chattering or flighty, light-headed person.
LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...
Collins
World English Dictionary
efficacious (ˌɛfɪˈkeɪʃəs)
 
—adj
capable of or successful in producing an intended result; effective as a means, remedy, etc
 
[C16: from Latin efficāx powerful, efficient, from efficere to achieve; see effect]
 
effi'caciously
 
—adv
 
effi'caciousness
 
—n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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