overoptimistic

British  

/ ˌəʊvərˌɒptɪˈmɪstɪk /

adjective

1. excessively optimistic

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Example Sentences

The VP, on the other hand, may be overoptimistic, because they are the ones making these decisions about big deployment, and therefore they might try very hard to see the positive.

From The Wall Street Journal

However, he also cautioned against being overoptimistic as the price points remain unknown.

From Reuters

England were in charge of the first Test at Edgbaston before the cult of Bazball resulted in an overoptimistic declaration and reckless batting.

From BBC

Max Boot, a scholar at the Council on Foreign Relations and onetime leading neoconservative, said this month on Twitter that he “was wildly overoptimistic about the prospects of exporting democracy by force.”

From New York Times

While these overoptimistic estimates of accuracy get published in the scientific literature, the lower-performing models are stuffed in the proverbial “file drawer,” never to be seen by other researchers; or, if they are submitted for publication, they are less likely to be accepted.

From Scientific American