undeclared
/ˌʌndɪˈkleəd/adjective
1- not publicly announced, admitted, or acknowledged未宣布的; 未公开的：
undeclared war.
不宣而战的战争。
1.1
- (especially of taxable income or dutiable goods) not declared（尤指应纳税收入、货物）未申报的。