This is a single kanji with an い on the end, meaning you know it's probably an adjective. What's the adjective form of cold? It's cold.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading which you learned with the kanji (Samurai (さむ)). Remember?
It's too cold to get out of bed.
I had to wait an hour in this cold for the bus.
I’m going to Hawaii not only to escape the cold, but to see my family.