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• unsupported
• unsuited
• uneven
• uninterested
• unused
• unsparing
• unacquainted
• unhealthy
• unconcerned
• unsympathetic
• unusable
• understanding
• unwanted
• unlock
• unwonted
• undone
• uproot
• untimely
• unkindly
• umbilicus
• undertaking
• unstudied
• unpolished
• unwind
• undue
• unregenerate
• unite
• unfeeling
• unreadable
• usher
• unlike
• underclass
• undying
• upstairs
• usable
• unnecessary
• unzip
• unfashionable
• unbeliever
• untamed
• unsuccessful
• unassailable
• usually
• unabashed
• unaccompanied
• unnatural
• unfledged
• uniform
• unforeseen
• uphold
• unprompted
• unclear
• unvarnished
• unemployment
• unyielding
• upkeep
• urban
• ultimatum
• umber
• unutterable
• ungrateful
• untrained
• uterine
• urbanity
• unity
• unkind
• unjustifiable
• uninvited
• unmistakable
• undress
• unaware
• unsound
• untrustworthy
• unavoidable
• uncanny
• undeniable
• undetermined
• underscore
• unavailing
• unexperienced
• urbane
• ungraceful
• unfetter
• unsettle
• unprotected
• uppermost
• uninhabited
• uninformed
• unplug
• understate
• undaunted
• unavailability
• uncertain
• unparalleled
• undesirable
• urgent
• unattached
• uninviting
• unsophisticated
• unfading
• uproar
• underneath
• unlearned
• unbidden
• umbrella
• unreachable
• unbalanced
• untroubled
• unexplainable
• unlatch
• unfortunate
• ulterior
• unlikely
• unfaithful
• untrue
• underground
• unceasing
• unfeasible
• unsystematic
• unconditional

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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