TBESG:χλιαρόςlukewarmG:A χλιαρός, -ά, -όν (< χλίω, to become warm), warm, tepid; metaph., of persons, luke-warm: Rev.3:16.† (AS)
Thayer:1) tepid, lukewarm 2) metaph. of the condition of the soul wretchedly fluctuating between a torpor and a fervour of love