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• useful
• unevitable
• unanticipated
• umbilical
• unison
• unselfish
• unmeasurable
• uplift
• untimely
• uninhabited
• unskilled
• unlimited
• urgent
• unsatisfied
• universality
• uphill
• unlearned
• unpack
• ungrateful
• unguarded
• unprepared
• unaided
• unbounded
• underscore
• undern
• urban
• upkeep
• unworkable
• unafraid
• unpalatable
• undercurrent
• unresponsive
• unwholesome
• unexplainable
• uncivil
• uniformity
• unprompted
• unreadable
• ugliness
• university
• unassisted
• undress
• upcoming
• unearth
• unbalanced
• upon
• uncritical
• untried
• uncivilized
• umber
• unmistakable
• umbrella
• usual
• universal
• upset
• unchaste
• untamed
• until
• unskillful
• unconditional
• utter
• understand
• understanding
• unhinge
• unsuitable
• unkindness
• unattached
• unaffected
• unfashionable
• unite
• unusual
• upgrade
• unutterable
• undoubted
• unclothe
• Ukraine
• uninteresting
• unity
• undignified
• uncover
• unrestrained
• undue
• ungracious
• unrepentant
• unaccompanied
• unidentified
• unimportant
• ure
• usurp
• up
• unpleasant
• undesirable
• unsparing
• unqualified
• unfit
• unable
• unseemly
• unchangeable
• uncultivated
• unprincipled
• undertone
• unfading
• unhelpful
• unscathed
• unwonted
• uncontrolled
• unchain
• update
• upshot
• uncontrollable
• undeceive
• unrelated
• uranium
• unready
• unclean
• unprotected
• unicycle
• uncalled
• unschooled
• uncertain

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因篇幅关系，字母U开头的单词只列出前 120 个；字母U开头的英语单词由君君词典提供查询