adjective
- impossible or very difficult to discover, notice, or identify
Examples
- The virus remained undetectable in routine blood tests.
- Modern stealth aircraft are designed to be undetectable by radar.
- The poison was virtually undetectable and had no taste or smell.
- Security cameras captured footage, but the intruder’s face was undetectable.
- The changes in her behavior were so subtle as to be almost undetectable.
- Advanced encryption makes the data undetectable to hackers.