Optimism (n.) is an intellectual disorder held with the greatest tenacity by those most accustomed to the mischance of falling into adversity.
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Optimism (n.) is the doctrine or belief that everything is beautiful, including what is ugly.
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Optimism (n.) is the doctrine that black is white.
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Optimism (n.) is the doctrine, or belief, that everything is beautiful, including what is ugly, everything good, especially the bad, and everything right that is wrong.
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Optimism (n.) is being a blind faith, it is inaccessible to the light of disproof- an intellectual disorder, yielding to no treatment but death.