形容詞 cheerful:

1. being full of or promoting cheer; having or showing good spirits
2. pleasantly (even unrealistically) optimistic
   同義詞：pollyannaish, upbeat

1. Whether (she is) sick or fine, she is always cheerful.
   不管她生不生病，她總是開開心心的。
2. His cheerful manner belied his real feelings.
   他那快活的樣子掩飾了他真實的感情。
3. A cheerful wood fire was crackling in the sitting room.
   熊熊的柴火在起居室的爐中噼啪作響。
4. The leader's vital and cheerful manner filled his men with courage.
   指揮官朝氣蓬勃和歡欣愉悅的神態(tài)使士兵們勇氣倍增。
5. In a joyful, cheerful, or happy manner; merrily.
   歡快地用快樂的、高興的方式; 喜氣洋洋地
6. I have a cozy and cheerful room.
   我有一個舒適的令人愉快的房間。
7. She remained cheerful throughout the trip.
   旅行中她始終興致勃勃。

cheer.ful

adj.（形容詞）
Being in good spirits; merry.See Synonyms at glad
興高采烈的；歡樂的參見 glad
Promoting a feeling of cheer; pleasant:
使人感到高興的；令人愉快的：
例句：
a cozy, cheerful room.
舒適的、令人愉快的房間

Reflecting willingness or good humor:
樂意的：表明誠心誠意或者愉快的：
例句：
cheerful labor.
樂意的效勞

【引伸】
cheer.fully
adv.（副詞）
cheer.fulness
n.（名詞）