1530s, "without being aware," from un- (1) "not" + aware + adverbial genitive -s. Meaning "without being noticed" is recorded from 1660s. Form unaware is recorded from 1590s.
雙語例句
1. Investors and currency dealers were caught completely unawares by the Bundesbank's action.
投資者和外匯交易商被德意志聯(lián)邦銀行的這一舉措打了個措手不及。
來自柯林斯例句
2. Sometimes our expectations sneak up on us unawares.