| a. | 1. | Not efficacious; not having power to produce the effect desired; inadequate; incompetent; inefficient; impotent. |
| Adj. | 1. | inefficacious - lacking the power to produce a desired effect; "laws that are inefficacious in stopping crime" Antonyms: efficacious - marked by qualities giving the power to produce an intended effect; "written propaganda is less efficacious than the habits and prejudices...of the readers"-Aldous Huxley; "the medicine is efficacious in stopping a cough" |