1. not seen or noticed by anyone

Examples

• The thief slipped away unobserved in the darkness.
• She watched the birds from her window, remaining unobserved.
• The mistake went unobserved for several weeks.
• He hoped his nervousness would remain unobserved during the interview.
• The children played unobserved in the backyard.
• The security camera captured footage of the unobserved entrance.