bitter (bitterest superlative) (bitters plural )
1 adj In a bitter argument or conflict, people argue very angrily or fight very fiercely.
...the scene of bitter fighting during the Second World War.
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bitterly adv
Any such thing would be bitterly opposed by most of the world's democracies.
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bitterness n-uncount
The rift within the organization reflects the growing bitterness of the dispute.
2 adj If someone is bitter after a disappointing experience or after being treated unfairly, they continue to feel angry about it.
She is said to be very bitter about the way she was sacked...
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bitterly adv
`And he sure didn't help us,' Grant said bitterly.
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bitterness n-uncount
I still feel bitterness and anger towards the person who knocked me down.
3 adj A bitter experience makes you feel very disappointed. You can also use bitter to emphasize feelings of disappointment.
I think the decision was a bitter blow from which he never quite recovered...
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bitterly adv
I was bitterly disappointed to have lost yet another race so near the finish.
4 adj Bitter weather, or a bitter wind, is extremely cold.
Outside, a bitter east wind was accompanied by flurries of snow.
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bitterly adv
It's been bitterly cold here in Moscow.
5 adj A bitter taste is sharp, not sweet, and often slightly unpleasant., (Antonym: sweet)
The leaves taste rather bitter.
6 n-mass Bitter is a kind of beer that is light brown in colour.
(BRIT)
...a pint of bitter.
7 If you say that you will continue doing something to the bitter end, especially something difficult or unpleasant, you are emphasizing that you will continue doing it until it is completely finished.
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to the bitter end phrase
(emphasis)
The guerrillas would fight to the bitter end, he said, in order to achieve their main goal.