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unmanned	not having a human pilot or crew.
unnatural	not according to natural laws or processes. [2 definitions]
unnecessary	not needed or required.
unpack	to take out of a package, suitcase, or container. [2 definitions]
unpleasant	not pleasant or agreeable; distasteful.
unplug	to remove (the plug of an electrical appliance) from an outlet.
unpopular	not liked or approved of by many people.
unravel	to undo; reduce from cloth to threads; cause to come apart. [3 definitions]
unreasonable	not acting or behaving with good sense; not guided by good judgment or sound thinking. [2 definitions]
unreliable	not able to be relied on.
unrest	a state of trouble, disturbance, or lack of satisfaction.
unruly	not easy to restrict; difficult or impossible to control; wild.
unsatisfactory	not good enough to meet a need or desire; not satisfactory.
unseen	not seen, observed, or discovered; invisible; not noticed.
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. [3 definitions]
unsuitable	not proper or appropriate.
unsure	not certain; having doubt.
untangle	to free from a tangled or snarled condition. [2 definitions]

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