形容詞 giddy:

1. having or causing a whirling sensation; liable to falling
   同義詞：dizzy, woozy, vertiginous
2. lacking seriousness; given to frivolity
   同義詞：airheaded, dizzy, empty-headed, featherbrained, light-headed, lightheaded, silly

1. A giddy climb to the topmast.
   到船中桅的令人頭暈的攀登
2. They looked down from a giddy height.
   他們從令人眩暈的高度往下看。
3. The children enjoyed twirling round and round, but I felt giddy just watching them.
   孩子們喜歡不停地旋轉(zhuǎn)，但我看著他們就頭暈。

gid.dy

adj.（形容詞）
gid.di.er,gid.di.est

Having a reeling, lightheaded sensation; dizzy.
頭暈的，眼花繚亂的：有旋轉(zhuǎn)或暈眩感覺的；眩暈的
Causing or capable of causing dizziness:
眼花的，頭暈的：引起或能引起旋轉(zhuǎn)或眩暈感覺的：
例句：
a giddy climb to the topmast.
到船中桅的令人頭暈的攀登

Frivolous and lighthearted; flighty.
輕浮的，輕佻的；輕狂的
v.intr.tr.（不及物動詞和及物動詞）
gid.died,gid.dy.ing,gid.dies
To become or make giddy.
使眼花，使頭暈：變得或使人眼花繚亂或頭暈

來源：
Middle English gidi [crazy]
中古英語 gidi [瘋狂的]
from Old English gidig * see gheu(…)-
源自 古英語 gidig *參見 gheu(…)-

【引伸】
gid.dily
adv.（副詞）
gid.diness
n.（名詞）
<參考詞匯><同義詞>giddy,dizzy,vertiginousThe central meaning shared by these adjectives is .producing a sensation of whirling and a tendency to fall.:
這些形容詞共有的中心意思是.產(chǎn)生旋轉(zhuǎn)或要跌倒的感覺.：
例句：
a giddy precipice;
令人眩暈的懸崖；

例句：
a dizzy pinnacle;
讓人頭暈的尖頂；

例句：
a vertiginous height.
使人眼花的高度

<注釋>The wordgiddy refers to fairly lightweight experiences or situations, but at one time it had to do with profundities.Giddy can be traced back to the same Germanic root .gud- that has given us the wordGod. The Germanic word.gudigaz formed on this root meant .possessed by a god.. Such possession can be a rather unbalancing experience,and so it is not surprising that the Old English representative of.gudigaz, gidig, meant .mad, possessed by an evil spirit,. or that the Middle English development ofgidig, gidi, meant the same thing, as well as .foolish; mad (used of an animal); dizzy; uncertain, unstable..Our sense .lighthearted, frivolous,. represents the ultimate secularization ofgiddy.
單詞giddy 完全是指不必要的經(jīng)歷或情況， 但同時與深度有關(guān)。Giddy 能被追溯到它的德語詞根 gud- ， 從同一詞根我們得到單詞God 。 德語詞gudigaz 由這個詞根形成的意思是.由上帝占有.。 這種擁有可以是一種不平衡的經(jīng)歷，所以對于gudigaz ,gidig 在古英語的表達(dá)并不奇怪， 意思是.瘋狂的，被惡魔占據(jù)的.或gidig, gidi 有在中古英語中發(fā)展而來的同樣的意思， 另外還有.呆的；瘋狂的（用于動物）；頭暈眼花的；不確定的，不穩(wěn)定的。.我們.輕浮的，輕佻的.的解釋代表了最終世俗化的giddy