Unperceived (adjective)

1. Not noticed or recognized.
2. Not perceived or understood.
3. Not present in conscious awareness.

Origin:

Late 16th century, from un- + perceived.

Examples:

1. The unperceived error was overlooked by everyone.
2. The unperceived clue was hidden in plain sight.
3. The unperceived fact was unknown to all.
4. The unperceived gesture was ignored by the audience.
5. The unperceived message was encoded in the music.