Etymologically

lukewarm

Etymology and origin of the English word lukewarm

Formation
Inherited
Inherited from
Middle English lukewarme

Pronunciation

  • IPA: /ˌluːkˈwɔːm/ (UK); /ˌlukˈwɔɹm/ (US)[1]

Etymology

It is inherited from Middle English lukewarme,[2] a compound of warm and Middle English luke “tepid”,[3][4][5][6] a word of uncertain origin.[6][5] It may be a variant of lew “tepid”, from Old English hlēow,[3][5][2] and Merriam-Webster relates it to Old High German lāo “lukewarm”.[4]

Earliest recorded meaning

Moderately warm, tepid (late 14th century; 1373 in Barnhart).[5][6][7]

Semantic evolution

The figurative sense, of people and their actions lacking zeal or enthusiasm, is recorded from the 1520s.[6][7] English once used lukewarm as a noun for an unenthusiastic person (1693) and as a verb (1592).[7]

Timeline

  • 1373 – luke warm, tepid.[5]
  • about 1522 – lacking zeal or enthusiasm.[7][6]
  • 1592 – verb, to make lukewarm.[7]
  • 1693 – noun, an unenthusiastic person.[7]

Modern meaning

Adjective

  1. Mildly warm; tepid.
  2. Lacking conviction or enthusiasm; half-hearted.

Word family

  • lukewarmly
  • lukewarmness
  • lee
  • tepid

Usage notes

Random House lists half-hearted, cool and apathetic as synonyms of the figurative sense.[2]

References

  1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c Random House Webster's Unabridged Dictionary (1999), 2nd ed., New York: Random House
  3. ^ a b The American Heritage Dictionary of the English Language (1992), 3rd ed., Boston: Houghton Mifflin
  4. ^ a b Merriam-Webster's Collegiate Dictionary (2003), 11th ed., Springfield, Mass.: Merriam-Webster
  5. ^ a b c d e Barnhart, Robert K., ed. (1995), The Barnhart Concise Dictionary of Etymology, New York: HarperCollins
  6. ^ a b c d e Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  7. ^ a b c d e f Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press
Cite this entry

“Lukewarm.” Etymologically, 15 Oct. 2026, etymologically.com/en/lukewarm. Accessed 15 Oct. 2026.

Last edited on . ·