This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Mildly warm; tepid.

adj. Lacking conviction or enthusiasm; indifferent: gave only lukewarm support to the incumbent candidate.

adj. Of a temperature between warm and cool.

adj. Not very enthusiastic (about a proposal or an idea).

adj. Moderately warm; neither cold nor hot; tepid.

adj. Not ardent; not zealous; cool; indifferent.

Only moderately warm; tepid; neither cold nor hot.

Not ardent; not zealous; cool; indifferent: as, lukewarm obedience.

adj. moderately warm

adj. feeling or showing little interest or enthusiasm

"Just dip in lukewarm water and bring to the wall each sequentially numbered panel."

warm    unenthusiastic   

tepid    cool    indifferent    languid   

Norm    conform    deform    disinform    dorm    form    inform    misinform    norm    perform   

tepid    warmest    salty    halfhearted    fitful    perfunctory    soapy    foamy    stale    insipid