If you describe someone, especially a young woman, as an airhead, you are critical of them because you think they are not at all clever and are interested only in unimportant things.
英漢詞典釋義
n.
<俚,貶>笨蛋,傻瓜,白癡
I’m not a complete airhead.我可不是個(gè)十足的大傻瓜。
英英詞典釋義
Noun
1. a flighty scatterbrained simpleton;
"she's a total airhead""every airhead on a big salary rushed out to buy one"