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Not meant or adapted for a given purpose; inappropriate: a solvent that is unfit for use on wood surfaces.
(adjective)
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Below the required standard; unqualified: an unfit parent.
(adjective)
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Not in good physical or mental health.
(adjective)
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Biology Unable to survive or produce viable offspring in a particular environment.
(adjective)
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To cause to be unsuited or unqualified: "Having run for president . . . often unfits a man for lesser or more useful subsequent work” ( Garry Wills).
(verb-transitive)
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.