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What is the opposite of efficient?

Need antonyms for efficient? Here's a list of opposite words from our thesaurus that you can use instead.

(of a system) Opposite of capable of maximizing productivity at no expense of extra resources
“Procedures that were set up to expose and correct dishonesty were themselves blocked or shown to be inefficient.”
Opposite of able to produce results, or cause effects
“To this end, ineffectual tools are usually worse than having no tools at all.”
(attributive to a person) Opposite of having the ability to make prudent and careful decisions on the use of resources
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“He is either deliberately misconstruing the statement, or is utterly incompetent.”
Opposite of arranged or carried out with a planned or organized method or procedure
Opposite of able to persuade or convince
Opposite of still currently functioning or in operation
Opposite of fulfilling its function adequately
Opposite of having the ability to produce financial growth or gain
“This is an unprofitable business and some big decisions will need to be made soon on its future.”
Opposite of using materials at hand efficiently
“This is a wasteful process that will cause a net loss of nitrogen to livestock and pollution of the environment.”
Opposite of made or adjusted to be as efficient as possible
Opposite of capable of reducing the time needed to perform a task
Opposite of denotes the effectiveness or dominance of a particular action
“Leaders who do not look after the interests of their followers are not only unethical but ineffective.”
(of persons) Opposite of influential or powerful in rank, position, or status
“He was touted as a great and strong leader but ultimately proved to be highly uninfluential.”
Opposite of without obstructions or difficulties
“Going on holidays with children can be both an exciting and fraught prospect.”
Opposite of always successful, not likely to fail
Opposite of complete with regard to every detail
“He was relieved a minute later when the soldier left after only a cursory check of the room, seeming completely unsuspicious.”
Opposite of having all the necessary components or features neatly fitted into a small space
“Being an air-to-air heat exchanger, a sizable unit is required as a function of charge mass flow and desired exit air temperature.”
Opposite of being in a healthy and functional state
“His faculties were still ailing after having endured multiple concussions during his sporting career.”
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