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Children's Dictionary
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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.
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. [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]