† ˈlukewarmlingObs. [f. lukewarm a. + -ling1.] A lukewarm person. Also attrib. 1626W. Fenner Hidden Manna (1652) 31 Art thou a swearer, a lyar, or a luke-warmling?a1640― Sacrif. Faithfull (1648) 15 The lukewarmling deadhearted and vaine⁓thoughted professor.Ibid. 167.