Exact Match:
- unbeknown
- without someone's knowledge; "unbeknownst to me, she made all the arrangements"
Synonyms:
- able,
- enigmatic,
- incalculable,
- incognizable,
- mysterious,
- puzzling,
- sealed,
- strange,
- unapparent,
- unapprehended,
- unascertained,
- uncharted,
- unclassified,
- undisclosed,
- undiscoverable,
- undiscovered,
- undivulged,
- unexplained,
- unexplored,
- unexposed,
- unfamiliar,
- unfathomed,
- unheard,
- unheard-of,
- unidentified,
- uninvestigated,
- unknowable,
- unknown,
- unperceived,
- unplumbed,
- unrevealed,
- unsuspected,
- untouched,
- virgin