"tepid" in the adjective sense
1. lukewarm, tepid
moderately warm
"he hates lukewarm coffee"
"tepid bath water"
2. halfhearted, half-hearted, tepid, lukewarm
feeling or showing little interest or enthusiasm
"a halfhearted effort"
"gave only lukewarm support to the candidate"
Source: WordNet® (An amazing lexical database of English)
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