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unsettled not fixed, stable, or constant; variable. [5 definitions]
unsightly not pleasant or agreeable to look at; ugly.
unstable likely to change suddenly. [2 definitions]
unsteady not stable or secure; not firm. [2 definitions]
unsuitable not proper or appropriate.
unsure not certain; having doubt.
untangle to free from a tangled or snarled condition. [2 definitions]
untie to free from being tied or bound. [3 definitions]
until up to the time when. [5 definitions]
untrue not correct or accurate; false. [2 definitions]
unusual not usual or ordinary; not common; remarkable.
unwell in poor health; sick; ill.
unwind to undo from a wound or twisted state; remove the twists from. [4 definitions]
up to, toward, at, or in a higher place or position. [23 definitions]
up- a prefix that means "up" or "upward."
upbringing the training and rearing of a child or children.
update new or recent information in a particular area. [2 definitions]
up for grabs (informal) able to be taken by anyone; not yet decided.
upgrade an upward slope or incline. [2 definitions]
upheaval an act, instance, or condition of being raised or heaved upward. [2 definitions]
uphill on an upward slope or in an upward direction. [3 definitions]