Unseen means not seen or not noticed, either because something is hidden, invisible, or simply overlooked. When you walk past something unseen, you miss it completely, your eyes never registering that it was there. A squirrel might dart behind a tree, remaining unseen by the hawk circling overhead. A teacher might spot an unseen error in your essay that you read three times without catching.

The word often describes dangers or forces we can't detect. Germs are unseen enemies that cause illness. In a story, an unseen presence might create suspense, when characters sense something watching them but can't see what it is. Scientists study unseen forces like gravity and magnetism that affect our world powerfully despite being invisible.

Sometimes unseen describes things deliberately kept hidden. A magician's trick relies on unseen wires or mirrors. Spies work best when they remain unseen by their targets.

The word can also mean unnoticed or unappreciated. A student who works hard without recognition might feel their efforts go unseen. Kind acts done without anyone watching are sometimes called unseen good deeds. In this sense, unseen captures how some of the most important things in life, whether dangers or virtues, escape our immediate attention.