English
heatless
From heat + -less.
Formed from heat + -less
Proto-Indo-European *keHy- ‘heat’
Proto-Germanic *haitį̄
Proto-West Germanic *haitī
Old English hǣtu
Middle English hete ‘heat’
English heat
Today it means
adj Without heat.
Language periods are conventional ranges, not dates for this word.
Etymograph / heatless