inefficacious
1 antonym for inefficacious — opposites grouped by meaning.
Adj — Not able to produce the result that was intended.
1 antonym for inefficacious — opposites grouped by meaning.
Adj — Not able to produce the result that was intended.
by FreeDict.com
Learn new English words for daily use — each one with meaning, pronunciation and an example. Free, no signup.
Start learning