cold has 12 distinct synonyms spread across 6 of its 16 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is hot.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
having a low or inadequate temperature or feeling a sensation of coldness or having been made cold by e.g. ice or refrigeration
“a cold climate”
extended meanings; especially of psychological coldness; without human warmth or emotion
“a cold unfriendly nod”
lacking originality or spontaneity; no longer new
“moth-eaten theories about race”
a mild viral infection involving the nose and respiratory passages (but not the lungs)
“will they never find a cure for the common cold?”
the absence of heat
“the coldness made our breath visible”
the sensation produced by low temperatures
“he shivered from the cold”
8 of the 16 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for cold.
Synonyms, antonyms and the broader and narrower relations for cold come from Princeton University’s WordNet. Full sources and licences.