optimist

[op-tuh-mist]
noun
1.
an optimistic person.
2.
a person who holds the belief or the doctrine of optimism.

Origin:
1760–70; < French optimiste < Latin optim(um) (see optimum) + French -iste -ist

antioptimist, noun, adjective
overoptimist, noun
superoptimist, noun

cynic, optimist, pessimist, skeptic.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To Optimists
Example sentences
To look out in the future, it is better to be optimists than pessimists.
Yet even oil optimists concede that physical limits are beginning to loom.
Optimists say solar power could become as economical and efficient as fossil
  fuels.
Because wild-eyed optimists once said technology would change everything, it
  must have changed nothing.
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