undeclared /ˌʌndɪˈkleɚd/ adjective Learner's definition of UNDECLARED
: not stated or decided in an official way : not declared未声明的；未承认的；未申报的 -
The government has been waging an undeclared war against them for decades.政府数十年来一直在对他们不宣而战。
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an undeclared candidate未宣布的候选人
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a college student with an undeclared major所修专业未得到官方承认的大学生
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undeclared income [=income not reported on a tax form]未报税的收入