1 sentence for 白 (bái — in vain)

1. 我白等了一个小时，他还是没有出现。

   wǒ bái děng le yī gè xiǎo​shí, tā hái​shi méi​yǒu chū​xiàn.

   I waited for an hour in vain; he still didn't show up.

   Source: Dong Chinese Dictionary