from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Not fit; not having the correct requirements.
  • adj. Not fit, not having a good physical demeanor.
  • v. To make unfit; to render unsuitable, spoil, disqualify.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not fit; unsuitable.
  • transitive v. To make unsuitable or incompetent; to deprive of the strength, skill, or proper qualities for anything; to disable; to incapacitate; to disqualify

from The Century Dictionary and Cyclopedia

  • Not fit.
  • Not suited or adapted; not fitted.
  • Wanting suitable qualifications, physical or moral; not competent; unable: said of persons.
  • Synonyms Inapt. See apt.
  • Unqualified, unmeet, unworthy, incompetent, insufficient.
  • To make unsuitable; deprive of the proper or necessary qualifications for some act, activity, use, or purpose.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. below the required standards for a purpose
  • adj. not in good physical or mental condition; out of condition
  • adj. physically unsound or diseased
  • v. make unfit or unsuitable


from Wiktionary, Creative Commons Attribution/Share-Alike License

From un- +‎ fit.



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