ineffective
Americanadjective
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not effective; not producing results; ineffectual.
ineffective efforts; ineffective remedies.
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inefficient or incompetent; incapable.
an ineffective manager.
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lacking in artistic effect, as a literary work, theatrical production, or painting.
adjective
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having no effect
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incompetent or inefficient
Other Word Forms
Etymology
Origin of ineffective
Explanation
Use the adjective ineffective to describe something that doesn't work quite the way it's supposed to. You might complain about your ineffective guard dog, who wags his tail and licks everyone who comes to your house. When you're ineffective, you're unable to accomplish something you're trying to do. You might realize that you're an ineffective babysitter when you can't get the kids to go to bed. Ineffective comes from the Latin prefix in, "not, or opposite of," added to effective, whose Latin root is effectivus, "productive." When something's unproductive, inefficient, or incapable, it's ineffective.
Vocabulary lists containing ineffective
Florida's B.E.S.T. Common Prefixes: in-, im-, il-, ir-
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Villanueva, according to Luna, is “100% ineffective in that arena.”
From Los Angeles Times ● Oct. 31, 2026
For example, one form of a medication could successfully treat a disease, while its mirror-image counterpart might be ineffective or even harmful.
From Science Daily ● Oct. 24, 2026
Was largely ineffective and made some poor decisions.
From BBC ● Oct. 11, 2026
The detectors can also be ineffective as a new crop of AI "humanizing" tools emerges that rewrite AI-generated text to make it appear more human-like, researchers warn.
From Barron's ● Oct. 6, 2026
South Vietnam had an enormous military, but the forces were spread out and ineffective.
From "Most Dangerous: Daniel Ellsberg and the Secret History of the Vietnam War" by Steve Sheinkin
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Get a wordDefinitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
