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Adjective: lukewarm  'look'worm
  1. Moderately warm
    "he hates lukewarm coffee";
    - tepid
  2. Feeling or showing little interest or enthusiasm
    "gave only lukewarm support to the candidate";
    - halfhearted, half-hearted, tepid

See also: meh [informal], unenthused, unenthusiastic, warm

Encyclopedia: Lukewarm