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A combination of optimism and mysticism. When a philosopher or undergraduate student or other fanatical thinker comes up with a proof for why life is not a chaotic series of meaningless events ending in death. There are always serious problems with these arguments, so "optimisticism" always carries a negative connotation, similar to quaint or foolish.
Hegel's arguments for why mankind will one day see the realisation of the full freedom of the "spirit" in the real world add up to nothing but optimisticism.

The hippies thought they could create the perfect world with their optimisticism.

The president's speech was littered with the usual optimisticism about the "free" market.
by moe sizlac October 03, 2007