luke·warm 
/ˈlu:kˈwoɚm/ adjective
/ˈlu:kˈwoɚm/ adjective [more lukewarm; most lukewarm] 1 : slightly warm
▪ a lukewarm [=tepid] bath ▪ I hate drinking lukewarm coffee. 2 : not enthusiastic : not having or showing energy or excitement
▪ Our plan got a lukewarm reception. ▪ The producer was lukewarm about her script.
▪ a lukewarm [=tepid] bath ▪ I hate drinking lukewarm coffee.
▪ Our plan got a lukewarm reception. ▪ The producer was lukewarm about her script.
— luke·warm·ly adverb
▪ They reacted/responded lukewarmly to our plan.
▪ They reacted/responded lukewarmly to our plan.
