Synonyms and related words :
Laodicean, aestival, apathetic, blood-hot, blood-warm, calid, chill, chilly, cold, cool, equatorial, fervorless, genial, half-baked, halfhearted, hesitant, indecisive, indevotional, indevout, indifferent, indifferentist, insouciant, irresolute, irresolved, lackadaisical, luke, mild, neuter, neutral, nonchalant, nonobservant, nonreligious, perfunctory, phlegmatic, room temperature, room-temperature, subtropical, summery, sunny, sunshiny, temperate, tepid, thermal, thermic, toasty, tropical, uncertain, uncommitted, undecided, undevout, undutiful, unenthusiastic, unfrozen, unmoved, unreligious, unresolved, unresponsive, warm, warm as toast, warmish, wishy-washy, zealless