different between pessimistic vs unsanguine

English

pessimist +? -ic

pessimistic (comparative more pessimistic, superlative most pessimistic)

Marked by pessimism and little hopefulness; expecting the worst.
a pessimistic view of the future
Pertaining to the worst-case scenario.
a pessimistic estimate
(computing) Taking out exclusive locks on data to prevent conflicts with other processes that might modify it.
pessimistic concurrency; pessimistic locking

un- +? sanguine

unsanguine (comparative more unsanguine, superlative most unsanguine)

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