| unknown
| adjective
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| never seen or heard of.
| Highways were unknown in the 19th century.
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| unlikely
| adjective
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| not probable.
| An unlikely story.
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| unload
| verb
| v1
| to take things out of a vehicle or container.
| He unloaded the groceries from the shopping cart.
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| unlock
| verb
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| to open something by undoing a lock.
| He unlocked his bicycle.
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| unlucky
| adjective
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| having bad luck, or bringing bad luck.
| It’s thought to be unlucky to walk under ladders.
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| unnecessary
| adjective
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| not needed.
| It’s unnecessary to wear a coat in very hot weather
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| unoccupied
| adjective
| v1
| vacant, or not being used.
| The house had been unoccupied for months.
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| unorganized
| adjective
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| with no order or plan.
| The trip was very unorganized.
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| unpack
| verb
| v1
| to take things out of a container.
| Unpacking a suitcase.
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| unpleasant
| adjective
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| not pleasing, or not nice.
| An unpleasant smell.
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| unscrew
| verb
| v1
| to loosen by turning, or to undo screws.
| She unscrewed the numbers from the door.
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| untidy
| adjective
| v1
| in a mess.
| Her room was always untidy.
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| untie
| verb
| v1
| to undo something that is knotted, such as rope or thread.
| She untied the rope and rowed away.
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| until
| preposition
| v1
| up to the time of.
| We were awake until midnight.
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| untrue
| adjective
| v1
| false or not based on facts.
| The story about the two-tailed dog was untrue.
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| unused
| adjective
| v1
| not in use or never used.
| An unused notebook.
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| unusual
| adjective
| v1
| rare or not ordinary.
| A very unusual guitar.
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| unwise
| adjective
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| foolish or not smart.
| It was unwise to play catch in the house.
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| unwrap
| verb
| v1
| to take the wrapping or covering off something.
| She unwrapped her present.
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| up
| preposition
| v1
| toward a higher position.
| I walked up the hill to the house at the top.
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| jtoy
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| up
| adverb
| v1
| to or in a higher position.
| Stand up!
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| upright
| adverb
| v1
| sitting or standing up straight rather than bent over.
| The dog stood upright on its hind legs.
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| uproar
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| a state of noisy activity.
| The crowd was in an uproar.
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| upset
| verb
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| to make someone sad or anxious.
| The accident upset him.
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| upside down
| adverb
| v1
| with the top part underneath, or turned the wrong way up.
| He hung upside down from the bar.
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| upstairs
| adverb
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| to or on an upper story.
| The lights are on upstairs
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| upward
| adverb
| v1
| toward a higher position.
| She let go and the balloons drifted upward.
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| uranium
| noun
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| a silvery white, radioactive metal used for producing nuclear energy.
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| urge
| verb
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| to try to persuade someone to do something.
| He urged them to be careful when playing by the river.
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| urge
| noun
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| a powerful feeling that makes you want to do something.
| A sudden urge to sneeze.
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