为给定的英文单词提供同义词和反义词。输出包括这些词的定义和例句。
单词：happy
同义词：joyful, delighted, pleased, cheerful
定义：感到快乐或愉悦的心情
例句：I feel so happy when I'm around my friends. / She was happy to receive the promotion she worked hard for.

反义词：sad, unhappy, miserable, gloomy
定义：感到不快乐或沮丧的心情
例句：He was sad when he heard the news. / She was unhappy with the service she received at the restaurant.