What is another word for inefficacious?

Need synonyms for inefficacious? Here's a list of similar words from our thesaurus that you can use instead.

Adjective
Not producing the desired effect
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“Then I just started wittering in a pretty inefficacious way at the Carribean customer service woman.”
Adjective
Not negotiable
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Adjective
Not workmanlike
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Adjective
Unstreamlined. inefficient
Adjective
Not working or taking effect
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