lukecold
Between warm and cool temperatures, but cooler than lukewarm.
rare
A hot, more strictly speaking, a luke-cold, bath was welcome at this point, and in the dry clothes brought by the poste and a new pair of slippers, purchased on the spot for two and a half francs, I was perfectly comfortable, and, as usual, in that happy frame of mind that a hard day's tramp always brings.
Not very enthusiastic (about a proposal or an idea) and less enthusiastic than lukewarm would imply.
rare
In Texas, Conservative Price Daniel gave lukecold support to the Kennedy-Johnson ticket but had blazing hot support from the voters, who gave him a runaway third-term victory over Dallas Republican William Steger.
Where it comes from
Blend of lukewarm + cold, equivalent to luke (“lukewarm”) + cold.
Adapted from the Wiktionary entry lukecold (CC BY-SA 4.0).