1. (水等液体)微温的，微热的
Water or another liquid that is tepid is slightly warm.

2. (感情、反应等)冷淡的，不够热情的
If you describe something such as a feeling or reaction as tepid, you mean that it lacks enthusiasm.

1. feeling or showing little interest or enthusiasm

e.g. a halfhearted effort
gave only lukewarm support to the candidate

Synonym: halfheartedhalf-heartedlukewarm

2. moderately warm

e.g. he hates lukewarm coffee
tepid bath water

Synonym: lukewarm