If you describe something such as a feeling or reaction as tepid, you mean that it lacks enthusiasm. His nomination, while strongly backed by the President, has received tepid support in the Senate. = lukewarm
[ 'te-p&d ] (adjective.) 14th century. Middle English teped, from Latin tepidus, from tepEre to be moderately warm; akin to Sanskrit tapati it heats, Old Irish tess heat.