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lukewarm (adj.)

"neither cold nor hot, tepid," late 14c., from warm (adj.) + luke (adj.) "tepid" (c. 1200), a word of unknown origin. 

Figurative sense of "lacking in zeal, not ardent" (of persons or their actions) is from 1520s. Related: Lukewarmly; lukewarmness. Luke-warmth (1590s) is marked "rare" in OED.

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Definitions of lukewarm from WordNet

lukewarm (adj.)
moderately warm;
he hates lukewarm coffee
Synonyms: tepid
lukewarm (adj.)
feeling or showing little interest or enthusiasm;
gave only lukewarm support to the candidate
Synonyms: halfhearted / half-hearted / tepid
From wordnet.princeton.edu