给定一组英文单词，为每个单词提供三个近义词和三个反义词。


英文单词: happy, big, fast, cold
happy - 近义词: joyful, delighted, pleased; 反义词: sad, unhappy, miserable
big - 近义词: large, huge, enormous; 反义词: small, tiny, little
fast - 近义词: quick, rapid, swift; 反义词: slow, sluggish, unhurried
cold - 近义词: chilly, frigid, cool; 反义词: warm, hot, balmy