oversanguine

adjective
over·san·guine | \ˌō-vər-ˈsaŋ-gwən \

Definition of oversanguine 

: too confident or optimistic : excessively sanguine wasn't oversanguine about their prospects for success "Fiscal experts" may not be infallible, but it is hard to believe that oversanguine revenue projections can be solely responsible for so pathetic a performance.— James Gill

First Known Use of oversanguine

1710, in the meaning defined above

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The first known use of oversanguine was in 1710

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exaggeratedly or childishly emotional

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