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U
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unrivaled
better than all others in quality or skill
unruly
Difficult to control or manage.
unsafe
dangerous and likely to cause harm or injury
unsanitary
Dirty and likely to cause disease.
unsatisfactory
Not meeting expectations or standards.
unsatisfied
Not pleased or content.
unsatisfying
Failing to meet expectations or desires.
unsaturated
Not fully soaked or filled.
unsavory
having a bad or unpleasant taste or smell.
unsay
To take back or retract something said.
UNSC
United Nations Security Council, a global governing body.
unscathed
Not harmed or damaged.
unscheduled
Not planned or arranged in advance.
unscientific
not based on careful testing or facts
unscrupulous
Behaving dishonestly without moral principles.
unseal
To open something that is closed tight.
unseat
To remove someone from a position.
unsecured
Not fastened or protected.
unsee
To forget or disregard something seen.
unseemly
not proper or appropriate
unseen
Not visible or detected; hidden from view.
unselfish
putting others before oneself.
unsettle
To disturb or make someone anxious.
unsightly
Unpleasant to look at.