tep·id 
(tĕpĭd)
(tĕpĭd)adj.
1. Moderately warm; lukewarm.
2. Lacking in emotional warmth or enthusiasm; halfhearted: "the tepid conservatism of the fifties" (Irving Howe).
[Middle English, from Latin tepidus, from tepēre, to be lukewarm.]
te·pidi·ty, tepid·ness n.
tepid·ly adv.