unwary [ʌnˈweəri]

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adj.不小心的

not conscious of or careful about possible risks and dangers

Tax can be a minefield for the unwary.粗心大意的人在纳税方面很容易出错。
The stock market is full of traps for the unwary.对无风险意识的人而言，股票市场充满了陷阱。