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( abbreviation UV )

( PHYSICS ) Ultraviolet light cannot be seen, and makes your skin darker

You must protect your skin from harmful ultraviolet rays.

um • brel • la / лш' brela/ noun [ count ] a thing that you hold over your head to keep you dry when it rains

It started to rain, so I put my umbrella up.

um • pire / ' Ampaiar / noun [ count ]

( SPORTS ) a person who watches a game such as baseball or tennis , to make sure the players follow the rules — Look at referee .

► um • pire verb (um . pires, um . pir . ing, um pired)

The game was umpired by Jones. Prefix

un-

not; the opposite of un happy

un true (= not true ) un lock

un dress (= to take clothes off )

the UN / бэ |yu ' en / short for the United Nations

un .a .ble ® / An eibl / adjective

not able to do something

John is unable to come to the meeting because he is sick. —ANTONYM able The noun is inability .

un • ac • cept • a • ble / ^nak ' septabi /

adjective

If something is unacceptable , you cannot accept or allow it

This behavior is completely unacceptable. —ANTONYM acceptable

u • nan • i • mous / yu' nrenamas / adjective

with the agreement of every person The decision was unanimous.

un • armed / |\n ' armd / adjective

not carrying a gun or any weapon

an unarmed police officer —ANTONYM armed

un • at • trac • tive / ^na ' trrektiv / adjective

not nice to look at —ANTONYM attractive

un • a • void • a • ble / |\пэ ' voidabl /

If something is unavoidable , you cannot stop it or get away from it

This tragic accident was unavoidable. —ANTONYM avoidable

un • a • wa re A^H / ^na ' wer / adjective

not knowing about or not noticing someone or something I was unaware of the danger.

—ANTONYM aware

un • bear • a • ble / |\n'berabl /

If something is unbearable , you cannot accept it because it is so bad

Everyone left the room because the noise was unbearable.

un • bear • a • bly / |\n ' berabli / adverb It was unbearably hot.

un • be • liev • a • ble / |\nbi ' livabl /

very surprising or difficult to believe —SYNONYM incredible

un • bi • asedaw / |\n' baiast /

fair and not affected by your own or someone else's

opinions, needs, etc.

We need an unbiased selection process.

—ANTONYM biased

un • born / |\n 'born / adjective

not yet born her unborn child

un • cer • tain / An ' sartn / adjective

not sure; not decided

I'm uncertain about what to do.

an uncertain future

—SYNONYM unsure —ANTONYM certain

un • cer • tain • ty / \n ' sartnti / noun

[ count, noncount ] ( plural un .cer .tain .ties )

This decision should put an end to all the uncertainty.

ЦП .Cle Ф / 'лцк1 / noun [ count ]

the brother of your mother or father, or the husband of

your aunt

Uncle John

un • clear / |\n ' klir / adjective

not easy to see, hear, know, or understand It is unclear what the results will show.

not completely understanding something; not sure about something

I'm unclear about what you want me to do. —ANTONYM clear

un . com . fort. a . ble Ф / mi Ьты-ьы /

adjective

not pleasant to wear, sit on, lie on, etc. The chair was hard and uncomfortable.

—ANTONYM comfortable

feeling worried or embarrased, or making someone feel this way

I felt really uncomfortable when they started arguing in front of me.

There was an uncomfortable silence.

un • com • fort • a • bly / An ' kAmfartabli / adverb The room was uncomfortably hot.