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ultimate
sb's * aim is their main and most important aim, that they hope to achieve in the future [= final]
ultimately
finally, after everything else has been done or considered
unaccompanied
sb or sth that is * has no one with them
unaffected
1) not changed or influenced by sth 2) natural in the way you behave - use this to show approval
unaided
without help
unalterable
(formal) not possible to change
unambiguous
a statement, instruction etc that is unambiguous is clear and easy to understand because it can only mean one thing
unanticipated
an unanticipated event or result is one that you did not expect
unapproachable
seeming unfriendly and therefore difficult to talk to
unattached
1) not married or involved in a romantic relationship [= single] 2) not connected or fastened to anything
unattainable
impossible to achieve
unavailable
1) not able to be obtained 2) not able or willing to meet sb
unaware
not noticing or realizing what is happening
unbiased
* information, opinions, advice etc is fair because the person giving it is not influenced by their own or other people's opinions [= impartial]
uncharted
a situation or activity that you have never experienced or tried before:
unconstitutional
not allowed by the constitution (=set of rules or principles by which a country or organization is governed)
unconventional
very different from the way people usually behave, think, dress etc
undeniable
definitely true or certain
underestimate
1) to think or guess that sth is smaller, cheaper, easier etc than it really is [≠ overestimate] 2) to think that sb is not as good, clever, or skilful, as they really are
underestimate
a guessed amount or number that is too low [≠ overestimate]
undergo
if you * a change, an unpleasant experience etc, it happens to you or is done to you
underlie
(formal) to be the cause of sth, or be the basic thing from which sth develops
underlying
most important, although it is not easily noticed
undertake
(formal) to accept that you are responsible for a piece of work, and start to do it
undertaking
1) an important job, piece of work, or activity that you are responsible for 2) (formal) a promise to do sth
underwent
the past tense of undergo
undiminished
not weaker or less important than before
uneconomical
using too much effort, money, or materials to make a profit
unethical
morally unacceptable
unfounded
* statements, feelings, opinions etc are wrong because they are not based on facts
unification
the act of combining two or more groups, countries etc to make a single group or country
unified
created from more than one part, group etc
uniform
being the same in all its parts or among all its members
uniformity
the quality of being or looking the same as all other members of a group
unify
if you * two or more parts or things, or if they unify, they are combined to make a single unit [= unite; ≠ divide]
unique
1) (informal) unusually good and special 2) being the only one of its kind
unjustified
done without an acceptable reason
unlicensed
without a licence (=official document that gives you permission to do or have sth)
unobtainable
impossible to get
unparalleled
(formal) bigger, better, or worse than anything else
unprecedented
never having happened before, or never having happened so much
unpredictable
1) changing a lot so it is impossible to know what will happen 2) sb who is unpredictable tends to change their behaviour or ideas suddenly, so that you never know what they are going to do or think
unprincipled
(formal) not caring whether what you do is morally right [= unscrupulous]
unpublished
unpublished writing, information etc has never been published
unregulated
not controlled by a government or law
unreliable
unable to be trusted or depended on
unresolved
an * problem or question has not been answered or solved
unresponsive
not reacting to sth or not affected by it
unrestrained
not controlled or limited
unrestricted
not limited by anyone or anything
unscheduled
not planned or expected
unspecified
not known or not stated
unstable
1) likely to change suddenly and become worse 2) sth that is unstable is likely to move or fall
unstressed
an unstressed word or part of a word is pronounced with less force than other ones
unstructured
not organized in a detailed way, and allowing people freedom to do what they want
unsustainable
unable to continue at the same rate or in the same way
utility
1) a service such as gas or electricity provided for people to use 2) a piece of computer software that has a particular use 3) (formal) the quality of being useful, or the degree to which sth is useful
utilize
(formal) to use sth for a particular purpose