Opposite of efficacious

Opposite of efficacious word list. Here are a variety of words whose meaning is nearly the opposite of efficacious.

  • inefficacious

Hope the above listing of antonyms for efficacious is useful. This page may interest people looking for the opposite of efficacious and efficacious opposite.



Popular phrases for this post include, opposite of efficacious, opposite of efficaciously.

You can help improve this list by adding more opposite words here. Thanks!