Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Mildly warm; tepid.
  • adjective Lacking conviction or enthusiasm; indifferent.

from The Century Dictionary.

  • Only moderately warm; tepid; neither cold nor hot.
  • Not ardent; not zealous; cool; indifferent: as, lukewarm obedience.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Moderately warm; neither cold nor hot; tepid.
  • adjective Not ardent; not zealous; cool; indifferent.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Of a temperature between warm and cool.
  • adjective Not very enthusiastic (about a proposal or an idea).

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

  • adjective moderately warm
  • adjective feeling or showing little interest or enthusiasm

Etymologies

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

[Middle English leukwarm : leuk, luke (possibly alteration of leu, from Old English hlēow; see kelə- in Indo-European roots) + warm, warm; see warm.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle English lukewarme ("lukewarm, tepid"), equivalent to luke (“lukewarm”) +‎ warm. First element believed to be an alteration of Middle English lew ("tepid"), from Old English hlēow ("warm, sunny"), from Proto-Germanic *hliwjaz, *hlēwaz, *hlūmaz, *hleumaz (“warm”), from Proto-Indo-European *ḱal(w)e-, *ḱel(w)e-, *k(')lēw- (“warm, hot”). Cognate with Dutch lauw ("tepid"), German lauwarm ("lukewarm"), Faroese lýggjur ("warm"), Swedish ljum ("lukewarm"), ljummen ("lukewarm") and ly ("warm"), Danish lummer ("muggy"), Danish and Norwegian lunken ("tepid"), Swedish dialectal ljummen ("lukwarm").

Examples

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