uncrossed - ussingite
- undesirable event
- undesirable signal
- undesired arrivals
- undetected misfire
- undifferentiated
- undirected pressure
- undiscovered
- undissociated
- undisturbed
- undisturbed territory
- undisturbed water level
- undisturbed zone
- undivided
- undomed salt
- undressed
- undrillable
- undrilled structure
- undulate
- undulated
- undulated ground
- undulated river bottom
- undulated seam
- undulating
- undulating anticline
- undulating bottom
- undulating boundary
- undulating country
- undulating extinction
- undulating fissure
- undulating fold
- undulating gradient
- undulating ground
- undulating land
- undulating plain
- undulating reflector
- undulating refractor
- undulation
- undulatory extinction
- undulatory movement
- undulatory zone