Home › Words › C › coolthcoolth/kuːlθ/coolth means the state of being cool, temperature-wise; coolness.coolth is pronounced /kuːlθ/.EtymologyFrom cool + -th (abstract nominal suffix). Compare Old Dutch kuolitha (“coolness”).nounThe state of being cool, temperature-wise; coolness.Definitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.cool 78% match — Of a mildly low temperature. vs coolth →coolsome 75% match — Characterised or marked by coolness. vs coolth →coolness 74% match — Moderate chilliness. vs coolth →coolly 74% match — At a moderately low temperature. vs coolth →coolish 72% match — Quite cool. vs coolth →hypercool 70% match — Very cool (trendy, fashionable, pleasing, etc.) vs coolth →supercool 70% match — To cool a material below its transition temperature without that transition occurring. vs coolth →coolingly 69% match — So as to grow cooler; losing warmth. vs coolth →