noun which may take the genitive case particle 'no'
undeclared; unreported
Used in official or administrative contexts for something that has not been declared or reported, such as income, assets, or items at customs.
未申告の所得があると、税務署から指摘されることがある。
If you have undeclared income, the tax office may point it out.
税関で未申告の品物が見つかった。
Undeclared items were found at customs.