unplumbed (adj.)
- able
- all-inclusive
- boundless
- countless
- endless
- enigmatic
- eternal
- illimitable
- immeasurable
- immense
- incalculable
- incognizable
- incomprehensible
- inexhaustible
- infinite
- innumerable
- interminable
- limitless
- measureless
- mysterious
- perpetual
- puzzling
- sealed
- strange
- unapparent
- unbeknown
- unbounded
- uncharted
- unclassified
- undisclosed
- undiscoverable
- undiscovered
- unexplained
- unexplored
- unfamiliar
- unfathomable
- unfathomed
- unheard
- unheard-of
- unidentified
- universal
- unknowable
- unknown
- unlimited
- unmeasurable
- unmeasured
- unnumbered
- unperceived
- unrevealed
- unsuspected
- untold
- untouched
- virgin
