人的樣子很輕快
這一家把那層輕放在人身上：講話、揮手、走路的樣子都很輕。兩個意思的差別不在 gaily 本身，而在那個人做的事值不值得這麼輕鬆。
r · C1
In a happy, light way. Someone who speaks or moves gaily sounds or looks cheerful and free from worry at that moment.
開心地、輕快地
核心畫面
Picture something light and bright: a voice that goes up at the end, a hand , a row of red and yellow flags moving in the wind. Nothing is heavy, nothing is being weighed. That lightness is what gaily always adds, whatever it is attached to — it never tells you what happened, only how light it looked or sounded. Where the lightness lands is what makes the three uses different: on a person who is happy, on a person who should have been paying attention, or on a thing covered in strong colours.
gaily 的核心畫面可以想成一種「輕輕亮亮」的感覺：說話的尾音是往上揚的，手是揮著的，紅紅黃黃的小旗子在風裡動。沒…更多收起
gaily 的核心畫面可以想成一種「輕輕亮亮」的感覺：說話的尾音是往上揚的，手是揮著的，紅紅黃黃的小旗子在風裡動。沒有什麼是沉的，也沒有人在秤斤兩。不管接在什麼後面，gaily 加上去的都是這層輕。它從來不告訴你發生了什麼，只告訴你那個樣子有多輕。三個意思的差別，就在這層輕落在哪裡：落在一個心情好的人身上、落在一個本來該注意卻沒注意的人身上，還是落在一個顏色很鮮的東西上。From the word’s history
Wiktionary records gaily as gay + -ly, where -ly turns an adjective into an adverb. The older adjective covered both being cheerful and being bright to look at, and those two lines match the two halves of the word today.
Wiktionary 記的來源是 gay 加上 -ly，-ly 是把形容詞變成副詞的字尾。早期的 gay 同時有「快樂的」和「鮮亮的」兩面，而今天 gaily 的兩組用法正好對上這兩條線：一邊講心情，一邊講顏色。
Wiktionary (kaikki) gaily adverb entry: From gay + -ly. (source_ref kaikki:3f6f69a190036ae4:643509064:9342)
Two branches
東西看起來很鮮亮
這一家把那層輕從人身上移到東西上：不是心情輕快，而是顏色明亮、看了讓人心情好。它不能自由使用，只活在幾個固定組合裡。
r · C1
Used in front of words like coloured, painted and decorated to say that something looks bright and cheerful, usually because it has several strong colours on it.
色彩鮮豔地、裝飾得很亮眼