Etymologically
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unfit

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Pronunciation

Etymology

It is formed from English un- + fit, from the adjective fit.[2][3][4][5] The adjective fit is recorded from the mid 15th century and is of unknown origin.[3] The verb unfit is taken from the adjective by the OED and Etymonline, or as un- "reverse of" + the verb fit by the Shorter Oxford and Etymonline.[2][3][4]

Earliest recorded meaning

Not suitable, not adapted to a purpose, said of things: 1545, in Ascham's Toxophilus;[2] Etymonline gives the 1540s,[3] Merriam-Webster 1545[6] and Dictionary.com 1535–45,[5] while the Shorter Oxford dates the adjective to late Middle English.[4]

Semantic evolution

Used first of things, the adjective was applied to people and their qualities, "not qualified, not suited", from 1551 (the 1550s in Etymonline).[2][3] Johnson (1755) gave "improper; unsuitable" and "unqualified".[7] The sense "not physically fit", now common, is recorded from 1665.[2][4] A noun, a person not fit for some duty, especially because of poor health, appears in 1824 in military regulations,[2] and Merriam-Webster records unfits in the sense of people who are physically or morally unfit.[6] The verb, "to make unfit, disqualify", is dated 1611 by the OED and Merriam-Webster and the 1590s by Etymonline.[2][6][3]

Timeline

  • 1545 – of things, not suitable.[2][6]
  • 1551 – of persons, not suited or qualified.[2]
  • 1590s – verb, to make unfit (1611 in the OED).[3][2]
  • before 1653 – adverb, unfitly.[2]
  • 1665 – not physically fit.[2]
  • 1755 – Johnson: improper; unsuitable; unqualified.[7]
  • 1824 – noun, a person unfit for duty.[2]

Meanings

Adjective

  1. Not suitable or good enough for a purpose: The well water was unfit to drink.[8][6][2]
  2. Not qualified or able; incompetent: She was judged unfit to stand trial.[8][6][2]
  3. In poor physical condition; out of shape.[8][6][2]

Noun

  1. A person who is unfit, especially in health.[6][2]

Verb

  1. To make unfit; to disqualify: His temper unfitted him for diplomacy.[6][2][4]

Word family

  • unfitly
  • unfitness
  • unfitting
  • fit
  • misfit
  • fitness

References

  1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m n o p q r Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  3. ^ a b c d e f g Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ a b c d e Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
  5. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
  6. ^ a b c d e f g h i Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  7. ^ a b Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
  8. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins