* The thief slipped out of the building, unobserved by the security cameras. (Meaning: the thief went unnoticed)
* The experiment was conducted in a carefully controlled environment to ensure that no external factors could affect the results unobserved. (Meaning: no factors were overlooked or unaccounted for)
* The birdwatcher spent hours in the forest, hoping to catch a glimpse of the rare bird, but it remained unobserved. (Meaning: the bird wasn't seen)
* The child's behavior changed drastically when he thought he was unobserved. (Meaning: the child felt free to act differently when he believed no one was watching)
* The scientist's theory was based on an unobserved phenomenon that could not be replicated. (Meaning: the phenomenon wasn't witnessed or recorded)