Adjective lukewarm has 2 senses
  1. lukewarm, tepid - moderately warm; "he hates lukewarm coffee"; "tepid bath water"
    Antonym: cool (indirect, via warm)
  2. halfhearted, lukewarm - feeling or showing little interest or enthusiasm; "a halfhearted effort"; "gave only lukewarm support to the candidate"
    Antonym: enthusiastic (indirect, via unenthusiastic)
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