- unploughed
- unbroken
- unplowed
- unburden
- uncanny
- uncalled_for
- uncaria gambier
- undisputed
- unquestioned
- unsorted
- unceolate
- unendingly
- uncertain
- unchanged
- uncinariasis
- uncinate fasciculus
- uncinate fit
- uncinate process
- uncinate seizure
- unclear
- unscalable
- uncol
- unclothe
- unusually
- unlittered
- unclouded
- undefended
- unofficially
- unapproachability
- unselfconscious
- unbalanced audio line
- unbalanced line
- uncolored
- unbalanced modulater
- unbalanced merge sort
- unbalanced wire circuit
- uncommited storage list
- uncommited logic array
- unsalaried
- uncomplicated
- unconditional jump
- uncondensable
- unconditional transfer instruction
- unconditional jump instruction
- unconditional statement
- unsecured
- unguaranteed
- unsectarian
- unendowed
- unsurpassed