his efforts to restore the neglected houseplant back to health were belated and sadly inefficacious
an inefficacious medication for a rare form of tuberculosis
Recent Examples on the WebDay — who grew up watching the spelling bee — came up with the concept of exploring the psyche of a winner with an ultimately inefficacious career in 2015 while at a UCB improv sketch-writing class.
NBC News, 6 Oct. 2020
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'inefficacious.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.