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• unclean
• unprofessional
• utilization
• unimaginative
• uptake
• unacceptable
• unmistakable
• underage
• unready
• upturn
• unbar
• unworthy
• unquestioned
• unfeeling
• unfounded
• unreachable
• unapproachable
• undeveloped
• unrelated
• until
• understate
• utilize
• unfeasible
• untamed
• unreserved
• unaided
• unruffled
• unfathomable
• unlike
• unsubstantial
• umbrella
• unite
• unpopular
• undercover
• unauthorized
• unsuccessful
• unsavory
• unique
• unorganized
• undress
• unexplainable
• us
• unsolicited
• undergraduate
• unfailing
• underworld
• upload
• URL
• unclear
• union
• unfaithful
• undernourished
• understandable
• unconquerable
• unveil
• upstart
• unearth
• unloved
• usual
• unbroken
• underhand
• unbecoming
• unsteady
• unaccustomed
• unworkable
• unquenchable
• unprincipled
• usually
• uproarious
• unsuited
• uprising
• untimely
• unsupported
• uppity
• unmanly
• uniformity
• use
• uncaring
• used
• unification
• unobtrusive
• utmost
• unconstitutional
• useless
• utter
• unprecedented
• unnamed
• untouched
• uncanny
• unhealthy
• unfortunate
• unbearable
• uninterrupted
• unwelcome
• undesirable
• unfavorable
• unreasonable
• unbalanced
• unholy
• untruth
• undergird
• unreadable
• unaccountable
• unquestionable
• unbeatable
• understand
• unrestrained
• uninformed
• unpopularity
• undergo
• unkempt
• unmindful
• undue
• ultimate
• undivided
• unsparing
• unconventional
• upstanding
• unearthly
• undervalue

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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