IPA: /ˈluːkˌwɔːrmli/
KK: /luk'wɔrmli/
In a way that is moderately warm or lacking enthusiasm; not hot or cold, and not very excited or passionate.
She responded lukewarmly to the proposal, showing little interest.
Lukewarmly → It is formed from "lukewarm" (from Old English *lūcwarm*, meaning moderately warm) and the suffix "-ly" (meaning in a manner of). The word "lukewarmly" means in a moderately warm manner or with a lack of enthusiasm.
Think of something that is only "moderately warm" — that's what "lukewarmly" means, doing something in a way that is not too hot or too cold, just like the temperature.
No commonly confused words.