undetected

Imagine a secret agent slipping into a heavily guarded building—their goal is to remain undetected. It means something hasn't been found out or noticed, like a subtle change in someone's behavior that is overlooked by others. A problem can linger undetected for years before anyone realizes it exists. Think of it as existing "under the radar." Sometimes things are intentionally kept undetected, while other times they simply escape attention.

The word "undetected" describes something that has not been discovered, noticed, or perceived. It implies a state of being hidden, concealed, or overlooked. Think of a tiny crack forming in the foundation of a building—it might remain undetected for months, slowly growing until it becomes a serious problem.

"Undetected" isn't just about physical things; it can apply to feelings, intentions, or even abstract issues. A subtle illness might go undetected until symptoms become severe. A hidden motive could remain undetected by those around you. A thief hopes their actions will go undetected, while a scientist strives to make previously undetected particles visible with new technology.

The prefix "un-" means "not," and "detected" comes from the verb "to detect," meaning to discover or notice something. So, undetected literally means "not detected." It often carries a sense of secrecy, stealth, or simply being missed by the senses.

You might read about an undetected spy in a thriller novel, or hear about an undetected flaw in a product that leads to a recall. It's a word used when something remains hidden from view, whether intentionally or by chance. If something slips past observation, it remains undetected.