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Noun optimism has 2 senses
  1. optimism - the optimistic feeling that all is going to turn out well
    --1 is a kind of     hope
    Antonyms: pessimism
    --1 has particulars: sanguinity, sanguineness
  2. optimism - a general disposition to expect the best in all things
    --2 is a kind of     disposition, temperament
    Antonyms: pessimism
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