形容词

1. （尤指液体）微温的，微热的，不冷不热的
Something, especially a liquid, that is lukewarm is only slightly warm.

2. 缺乏兴趣的；不热情的；冷淡的
If you describe a person or their attitude as lukewarm, you mean that they are not showing much enthusiasm or interest.

1. feeling or showing little interest or enthusiasm

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

Synonym: halfheartedhalf-heartedtepid

2. moderately warm

e.g. he hates lukewarm coffee
tepid bath water

Synonym: tepid