- undated
- unicorn
- unidirectional
- unimaginable
- unimpeded
- unyielding
- ulcerous
- uninspiring
- unintelligent
- universalist
- university
- unjust
- unjustifiable
- union jack
- unkindness
- unknown
- unlawful
- unleavened rice cake
- unsuitably
- unobtrusive
- unpaid
- unparalleled
- unidentifiable
- union cabinet
- unpleasant
- unreality
- usb
- unreasonable
- unrecognizable
- unrefined
- unrelenting
- unopposed
- unpractical
- unreserved
- unwritten
- unscrew
- unseemly
- uprisal
- union
- upper arm
- untangle
- unwholesome
- urbanise
- unmourned
- until
- unutterable
- utopian scheme
- upper-ear-ring
- uproot
- upshot
- upturn
- unsolved
- utensil
- unutterably
- utter
- utter a loud cry
- uranium
- unintentional
- uvula
- umbilical cord
- upstanding
- ungrateful
- up to date
- ungovernable
- uphill
- upheaval
- unwise
- unsound
- unsightly
- unprincipled
- unpalatable
- uneven
- uninspired
- unforgivable
- unfathomable
- undoubtedly
- understate
- uncivil
- unburden
- unadorned
- ulcer
- unequal
- unbalanced
- underwhelming
- umpirage
- under an obligation
- untrue
- underwrite
- unbearable
- up the spout
- uncommon
- undergrowth
- unhappy
- unnerve
- unstudied
- undocumented
- unabated
- univalent
- unclaimed
- uteritis