/ ˌluːkˈwɔːm; NAmE -ˈwɔːrm/ adjective (often disapproving )
1.
slightly warm
SYN tepid :
Our food was only lukewarm.
➡ note at cold
2.
lukewarm (about sb/sth) not interested or enthusiastic :
a lukewarm response
She was lukewarm about the plan.
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WORD ORIGIN
late Middle English : from dialect luke (probably from dialect lew lukewarm and related to lee ) + warm .