ungrateful - nevděčný

adjective - not showing thanks, esp. when you should

 

urine - moč

noun - the liquid that leaves the body when you go to the toilet

 

unassuming - skromný

adjective - quiet and not wanting to be noticed, admired etc.

 

undisturbed - nerušený

adjective - not disturbed, bothered or interrupted

 

undersea - podmořský

adjective - happening under the sea

 

undiscovered - neobjevený

adjective - not discovered or not found

 

unwary - neopatrný

adjective - not knowing about a risk, not careful

 

unafraid - nebojácný, bez starosti, beze strachu

adjective - without fear

 

untidiness - neupravenost, nepořádek, neuklizenost

noun - an untidy state

 

urgently - naléhavě, urgentně, spěšně

adverb - immediately

 

unwillingness - neochota

noun - the state of not wanting to do something that is asked of you

 

undoubtedly - bezpochyb, nepochybně

adverb - without question, without doubt

 

unsuccessful - neúspěšný

adjective - not successful

 

union - unie

noun - a group of states that form one country

unanimous - jednomyslný, jednohlasný

adjective - agreed by all people