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Not efficient, as:
(adjective)
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Lacking the ability or skill to perform effectively; incompetent: an inefficient worker.
(adjective)
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Not producing the intended result; ineffective: an inefficient campaign against illegal drugs.
(adjective)
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Wasteful of time, energy, or materials: an inefficient design; outdated and inefficient methods.
(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.