Undeclared means not officially announced, stated, or made known. When something is undeclared, it exists or happens without being formally recognized or admitted.

You'll often hear this word in specific contexts. A student might enter college as an undeclared major, meaning they haven't yet chosen their main area of study. They're exploring their options before committing to biology, history, or engineering. Countries sometimes fight undeclared wars, conflicts that happen without any formal declaration.

The word also appears in customs and tax situations: travelers must declare valuable items they're bringing into a country, and income must be declared on tax forms. When someone keeps these things undeclared, they're hiding them from authorities who have a right to know.

In everyday life, feelings or intentions can be undeclared too. Someone might have undeclared feelings for a friend, meaning they haven't admitted or expressed those emotions yet. The word carries a sense that something should probably be declared but hasn't been, whether because of uncertainty, secrecy, or simply not being ready.