YOU SAID:
Hello, I'm cooler than you.
INTO JAPANESE
こんにちは、私はあなたより冷たいです。
BACK INTO ENGLISH
Hello, I am colder than you.
INTO JAPANESE
こんにちは、私はあなたより寒いです。
BACK INTO ENGLISH
Hello, I am colder than you.
That didn't even make that much sense in English.