happy,是快乐的意思。  

happy
[美] [ˈhæpɪ]  [英] [ˈhæpi]  
形容词(感到)高兴的;乐意的[F][(+at/about)][+to-v][+that]
I am happy to accept your invitation. 我很高兴接受你的邀请。

(用于祝词)快乐的[B]
Happy birthday to you! 祝你生日快乐!

(言行等)恰当的;巧妙的
A happy thought struck her. 她突然想到一个好主意。

幸运的;幸福的[B]
Their marriage has been a very happy one. 他们的婚姻非常美满。

满足的;满意的[F][(+about/with)]
He won't be happy with the result. 他对结果不会满意。

其他形式形容词happier; happiest
同义词及反义词同义词高兴的;满意的;满足的 [形容词]
cheerful; lighthearted; glad; delighted; jubilant; gay; jolly; joyful; merry; contented; satisfied; pleased; bright; blissful; radiant; 
近似同义词carefree; optimistic; pleasant; well; flushed; content; blessed; 
反义词高兴的;幸运的 [形容词]
sad; melancholy; gloomy; downcast; miserable; unhappy; 
近似反义词desolate; 
相关词组happy hours 
【口】快乐时间(指酒吧削价供应饮料的时间) 短语

happy as a clam 
非常高兴;非常满足 

(as) happy as a clam 
非常高兴;非常满足 

happy hour 
酒吧间术语,指通常为一小时或更长的优待顾客时间,或者饮酒减价,或者免费供应小吃 名词

happy mean 
中庸之道 

happy medium 
中庸之道;折中办法 短语

as happy as a clam 
非常高兴;非常满足