Etymology
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tepid (adj.)

c. 1400, from Latin tepidus "lukewarm," from tepere "be moderately warm," from PIE root *tep- "to be hot" (source also of Sanskrit tapati "makes warm, heats, burns," tapas "heat, austerity;" Avestan tafnush "fever;" Old Church Slavonic topiti "to warm," teplu "warm;" Old Irish tene "fire;" Welsh tes "heat"). Related: Tepidly; tepidity.

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Definitions of tepid

tepid (adj.)
moderately warm;
tepid bath water
Synonyms: lukewarm
tepid (adj.)
feeling or showing little interest or enthusiasm;
Synonyms: halfhearted / half-hearted / lukewarm
From wordnet.princeton.edu