Picture a light that is on and shows outward. Cheerfulness is not just feeling good inside — it is brightness that other people can see and warm themselves at.
From the word’s history
cheer originally meant the face or countenance (Old French chiere); to be of good cheer was to have a bright face. The outward, visible quality is in the word from the start.
cheer 這個字最早指的是「臉、面容」（古法文 chiere），be of good cheer 原意就是「臉色是好的」。所以「這份快樂是看得見的」不是後來才加上去的，而是這個字從一開始就長在臉上。cheerful 是 cheer + -ful，cheerfulness 再加 -ness，把那個亮著的表情變成一種可以談論的性質。
Wiktionary: cheerfulness < Middle English cherefulnes; cheer < Old French chiere "face, countenance" < Late Latin cara
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原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
cheerfulnessnoun/ˈt͡ʃɪɹfəlnəs/
- 1
The state of being cheerful; joy.
- Or he that exhorteth, on exhortation: he that giueth, let him doe it with simplicitie: hee that ruleth, with diligence: hee that sheweth mercy, with cheerefulnesse.
- The banded ones were all dressed in white gowns - a gay survival from Old Style days, when cheerfulness and May-time were synonyms - days before the habit of taking long views had reduced emotions to a monotonous average.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。