「冷たい」 (Tsumetai) is an i-adjective meaning 'cold' when referring to the temperature of a thing, like food, drinks, or objects, or a person's touch. It describes something that is cool to the touch or has a low temperature. For example, cold water or a cold hand.

「冷たい」は「cold」という意味で、「物」や「手」が冷たいときに使われるい形容詞です。