tep-id / tĕp-ĭd
1. not hot or cold, lukewarm
One does not like hot, the other does not like cold; make it tepid to make an agreement.
2. apathetic, indifferent, lacking enthusiasm or interest
We cannot be tepid disciples.
Pope Francis, 1936 –
From the Latin adjective tepidus, tepida, tepidum (moderately warm, lukewarm) formed from the stem of the Latin verb tepeo, tepere,(to be moderately warm) and the Latin adjectival suffix -idus, -ida, -idum.
Thank you to Allen Ward for providing this etymology.