- unvulcanized
- usage typical to the biharis—because of
- underwear
- undergarment
- undies
- underclothing
- uncheckable
- unsensational
- underquote
- ulmus fulva
- uroporphyrinogen
- uroporphyrin
- used only as the second member of the compound
- used as a suffix to mean engaged in
- undulating
- unpredictable
- unhistoric
- unhitch
- uncapped
- ups and downs
- uncropped
- urinary
- unwittingly
- unknowingly
- unsleeping
- unholiness
- unsanctification
- urinal stall
- unthaw
- unchurch
- unsmooth
- u_statistics
- unwritten law
- unfortunate (woman)
- underdone
- undirected
- unstring
- unwire
- undraped
- unclad
- unclothed
- ungarmented
- ungarbed
- untired
- untenable
- uncooked
- unboiled
- unhappily
- utility program
- utility function