[jkoudys]

Lukecool is perfect for my wife. She gets acid reflux very easily and needs to drink ice cold water always. Needing to describe an offending glass of water as "not ice cold" is clumsy and inaccurate, but saying it's lukewarm is inaccurate. Lukecool works for that range where it's definitely cool, but you could put your finger in it and reliably tell that it's well above 0°.

[zeroonetwothree]

You could say “chilled water”

[jkoudys]

Chilled sounds pleasant. The utility of lukecold is you're saying it's cold but not cold enough.