light-headed
adjective uk/ˌlaɪtˈhed.ɪd/ us/ˌlaɪtˈhed.ɪd/
头晕的，站立不稳的
If you feel light-headed, you feel weak and as if you are going to lose your balance.
She'd had a couple of glasses of champagne and was starting to feel light-headed. 她喝了几杯香槟酒后就开始觉得头晕了。