Lukewarm/ˌluːkˈwɔːrm/ Definition 1 of 2Pro Tip 1/3Mild Temperature Use 'lukewarm' to describe something that's slightly warm, without much heat. She prefers her tea lukewarm. Pro Tip 2/3No Extreme 'Lukewarm' indicates a middle-ground temperature, neither hot nor cold. After waiting, his coffee was just lukewarm. Pro Tip 3/3Neutral Context Often used in settings where extremes are avoided, such as bathing or drinking. He tested the pool to make sure it was lukewarm.