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• unattractive
• unsubstantial
• unconnected
• uneducated
• urge
• unexpected
• unprofitable
• unused
• urchin
• unceasing
• unbiased
• undo
• underrate
• undressed
• unpunctual
• unkempt
• unbecoming
• undeniable
• unrestrained
• up-to-date
• unintended
• unscramble
• unappreciative
• unchangeable
• unfaltering
• unapproachable
• unattached
• unimaginative
• unkindness
• unbeaten
• unreal
• unobtrusive
• unintelligible
• unrealistic
• underneath
• unimposing
• unobjectionable
• unequivocal
• university
• urbanity
• unavailability
• untrue
• unmask
• uncritical
• uninterrupted
• undefined
• unbalanced
• universe
• utter
• unbelievable
• unseemly
• unemployment
• upgrade
• useless
• uncover
• underestimate
• unabashed
• uniformity
• understatement
• unmindful
• undecided
• uninterested
• uncharitable
• up
• unsympathetic
• upright
• unschooled
• uncanny
• unselfish
• underhand
• U
• unthinking
• undetermined
• understanding
• unanimous
• undeveloped
• unchanging
• unending
• unforgivable
• unhallowed
• unknown
• usual
• unlock
• uncivilized
• unpolished
• uninfluenced
• unceremonious
• unfeasible
• undone
• USA
• unwell
• unaccompanied
• unsettled
• united
• update
• unobservant
• upholster
• unfledged
• undifferentiated
• unfeigned
• underlying
• unwise
• unambiguous
• undisputed
• unidentified
• upstanding
• unspoken
• understated
• unfaithful
• underpin
• unity
• unperturbed
• uncultivated
• unfruitful
• unwelcome
• unwitting
• unconventionality
• undefeated
• unconcerned
• unpardonable

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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