Also means
inefficient
Usage Note
Inefficace is invariable in gender — the same form serves masculine and feminine (un remède inefficace, une méthode inefficace). The noun form is l'inefficacité. It is stronger than peu efficace and implies a complete failure to produce results.
Examples
"Ce traitement s'est révélé inefficace."
Natural Translation
This treatment turned out to be ineffective.
Literal Translation
This treatment itself-revealed ineffective.
Related Words
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