Webster’s Revised Unabridged Dictionary · 1913
Lukewarm
Luke′warm′ (·wa̤rm′), a. [See Luke.] Moderately warm; neither cold nor hot; tepid; not ardent; not zealous; cool; indifferent. " Lukewarm blood." Spenser. " Lukewarm patriots." Addison.
An obedience so lukewarm and languishing that it merits not the name of passion. Dryden.
— Luke′warm′ly, adv. — Luke′warm′ness, n.