unawares

详细解释:ad. 出其不意地, 没想到, 不料, 不知不觉地
相关词组:
take sb unawares
take the enemy unawares
be caught unawares

英语解释：

副词 unawares:

without forethought or plan; inadvertentlysuddenly and unexpectedly- A.Lincolnat a disadvantage同义词：short