undetected
adj.not noticed or discovered by anyone. You use this when something happens or exists without being seen or caught.
adj.not noticed, discovered, or identified by an observer or a technical system. Often used to describe errors, illnesses, or movements that escape attention.
“The small error went undetected for several months.”
“The virus remained undetected in the patient's system because it did not cause any obvious symptoms initially.”
“Advanced stealth technology allows the aircraft to fly through enemy airspace undetected by traditional radar systems, providing a significant strategic advantage during reconnaissance missions.”
Often follows linking verbs like 'go', 'remain', or 'stay'.
“Millions of women are living with undetected heart disease .”
“Arrivals must be registered, with identity checks to prevent those who pose security or public health risks from entering the EU undetected.”
From un- + detected.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.