- unrepentant
- unselfish
- unsettle
- unskilled
- unsmooth
- unsociable
- unsophisticated
- unsparing
- unsure
- unsurpassed
- unsuspected
- unswerving
- unsympathetic
- untenable
- unthinkably
- untidy
- unwary
- unwelcome
- unwillingness
- unworthiness
- unworthy
- up against
- used for distilling
- usher
- usually
- up to the minute
- undisputed
- unnatural
- upper-class
- urgent
- upper garment
- unsterilized
- urinary bladder
- uninstall
- uncontrollableness
- untasted
- undertaken by
- upwardly tide
- upheld
- unarm
- undeterred
- unsalted
- unabashed
- unaccountable
- unacquainted
- unbelievable
- unbend
- unbind
- uncanny
- uncontrolled bursting of laughter
- unconventional
- undecided
- undefined
- under
- under one's nose
- undisguised
- undoing
- undoubted
- undue
- uneasy
- unfaltering
- unfamiliar
- unfit
- unflappable
- unforeseen
- unholy alliance
- unhygienic
- unicode
- unification
- uninformative
- unlooked-for
- unlucky
- unmanly
- unmannerly
- unmerciful
- unmistakable
- unpolished
- unpopular
- unquote
- unspoilt
- unstable
- unstruck
- unsuccessful person
- untimely
- untiringness
- untirring
- untried
- untruth
- untruthful
- update
- upgrade
- uphold
- upkeep
- uplift
- uplifting
- upper
- uppish
- upstairs
- upstart
- uptake