unidentified (adj.)
- able
- anonymous
- enigmatic
- incalculable
- incognito
- incognizable
- mysterious
- nameless
- puzzling
- sealed
- strange
- unacknowledged
- unapparent
- unbeknown
- uncharted
- unclassified
- undefined
- undisclosed
- undiscoverable
- undiscovered
- unexplained
- unexplored
- unfamiliar
- unfathomed
- unheard
- unheard-of
- unknowable
- unknown
- unmarked
- unnamed
- unperceived
- unplumbed
- unrecognized
- unrevealed
- unspecified
- unsuspected
- untouched
- virgin
