- undefiled
- undefinable
- undefine
- undefined
- undefined behavior
- undefined coefficient
- undefined error
- undefined key
- undefined record
- undefined statement
- undefined value
- undeformable system
- undeformed
- undelayed
- undelayed channel
- undelegated
- undelete
- undeliberate
- undeliberated
- undelightful
- undelition
- undeliverable
- undeliverable goods
- undeliverable mail
- undelivered
- undelivered cargo
- undelivered goods
- undeluded
- undemanding
- undemocratic
- undemonstrable
- undemonstrated
- undemonstrative
- undeniable
- undeniably
- undenied
- undenominational
- undenounced
- undependable
- undeplored
- undeposed
- undepraved
- undepreciated
- undepreciated cost
- undepreciated costs
- undepreciated value
- undepressed
- under
- under arms
- under clearance
- under construction
- under control
- under crossing
- under damping
- under development
- under drainage
- under equipped
- under excitation
- under expenditure
- under exposure
- under flooding
- under funded
- under guarantee
- under heated
- under layer
- under let
- under licence
- under load
- under loading
- under lubricated
- under mortality
- under offer
- under oolite
- under packaging
- under photography
- under planting
- under pressure
- under pressures
- under purlin
- under reinforced
- under repair
- under shock
- under sized
- under steam
- under steer
- under structure
- under voltage
- under way
- under wraps
- under-age
- under-agent
- under-breath
- under-burnt
- under-deck
- under-earth
- under-employment
- under-exploited
- under-frequency
- under-impedance
- under-inflation