Lukewarm \Luke"warm`\, 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. -- {Luce"warm`ly}, adv. -- {Luce"warm`ness}, n.