unrecognized

Definitions

Not identified or acknowledged as being known or familiar.

Not accepted or validated as being genuine, legal, or valid.

Examples

The software failed to launch because the file format remained unrecognized by the system.

He walked through the crowded streets as an unrecognized stranger in his own hometown.

The rare plant species went unrecognized by the local botanists for several decades.

Synonyms

unknown unidentified anonymous unacknowledged unnoticed unfamiliar nameless

Antonyms

recognized identified known acknowledged familiar noted distinguished