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inefficacious

in·ef·fi·ca·cious

inefficacious

 
pronunciation:
In e f keI shihs
part of speech: adjective
definition: unable to produce the desired result; useless; ineffective.
antonyms:
efficacious
similar words:
nugatory, useless, vain
derivations: inefficaciously (adv.), inefficaciousness (n.), inefficacity (n.)