Source : Webster's Revised Unabridged Dictionary (1913)

Tepid \Tep"id\, a. [L. tepidus, fr. tepere to be warm; akin to
   Skr. tap to be warm, tapas heat.]
   Moderately warm; lukewarm; as, a tepid bath; tepid rays;
   tepid vapors. -- {Tep"id*ness}, n.

Source : WordNet®

tepidness
     n 1: a warmness resembling the temperature of the skin [syn: {lukewarmness},
           {tepidity}]
     2: lack of passion, force or animation [syn: {lukewarmness}]