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Synonyms
inefficient
useless
ineffective
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in⋅ef⋅fi⋅ca⋅cious
/
ˌɪn
ɛf
ɪˈkeɪ
ʃəs
/
Show Spelled Pronunciation
[
in-ef-i-
key
-sh
uh
s
]
Show IPA
Use
in efficacious
in a Sentence
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in efficacious
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in efficacious
–adjective
not able to produce the desired effect; ineffective.
Origin:
1650–60;
in-
3
+
efficacious
Related forms:
in⋅ef⋅fi⋅ca⋅cious⋅ly,
adverb
in⋅ef⋅fi⋅ca⋅cious⋅ness,
in⋅ef⋅fi⋅cac⋅i⋅ty
/
ˌɪn
ɛf
ɪˈkæs
ɪ
ti
/
Show Spelled Pronunciation
[
in-ef-i-
kas
-i-tee
]
Show IPA
,
noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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[in-ef-i-key-shuh
s] 
[in-ef-i-kas-i-tee] , noun