Definition of optimist in US English:

optimist

noun

  • 1A person who tends to be hopeful and confident about the future or the success of something.

    ‘only an eternal optimist could expect success’
    • ‘Optimists say these initiatives could show the way for federal programs.’
    • ‘They are the starry-eyed optimists who cannot wait for adulthood to take the world for all it has to offer.’
    • ‘Even the most ardent Internet optimists would likely concede that basic reading skills have to precede computer literacy.’
    • ‘Her cousin must be either naive, or a hopeless optimist.’
    • ‘Optimists hope the Sept. 22 elections will bring change.’
    • ‘Optimists claim we are on the right track, but still cancer refuses to yield.’
    • ‘The outlook exceeds what most optimists thought possible just a few years ago.’
    • ‘An incurable optimist, I have every faith that technology will rid itself of its maladies and go on to create a better world.’
    • ‘Optimists argue that the U.S. will keep its innovation lead because it has invented new products before.’
    • ‘Stock market optimists point to signs of resilience in the wider US economy, citing stronger than expected consumer confidence figures.’
  • 2Philosophy
    A person who believes that this world is the best of all possible worlds or that good must ultimately prevail over evil.

    • ‘Such a hands-off view, coupled with the posit of ontologically distinctive quantifiers, is endorsed by various optimists, including McDaniel.’
    • ‘He identifies himself as a staunch optimist and an embodiment of positive thinking.’
    • ‘Hansberry was both a realist and an optimist, viewing the world with what she described as "sighted eyes and feeling heart".’
    • ‘Again, the philosophers have been charged as utopians and shallow optimists.’
    • ‘Thoreau thought he was an exceptional man, a philosopher of great faith, and an optimist.’
    • ‘Pessimists and optimists differ in how they explain the causes of both good and bad events.’
    • ‘Noguchi was a man of dualities: West and East, coarse and refined, optimist and realist.’
    • ‘I thought I was an optimist, but I'm just a utopian.’

Pronunciation

optimist

/ˈäptəməst/