From Longman Dictionary of Contemporary Englishover-optimisticˌover-optiˈmistic adjective EXPECTHOPEexpecting that things will be better than is possible or likely over-optimistic forecasts of economic growth
Examples from the Corpus
over-optimistic• Reports that the hostages will be released soon are over-optimistic.• But the letters lapse into exasperation and impatience as it became clear that the plans were wildly over-optimistic.• Even now, the shares of many housebuilders and contractors look over-optimistic.• Sometimes, though, the expectation is over-optimistic.• Inevitably occasions will also arise when an initial valuation proves over-optimistic, for example where a plaintiff makes an unexpectedly good recovery.• A new church with a rapid initial growth rate should beware of an over-optimistic future projection.• Retailers expect a bigger improvement in June, but their expectations have proved to be over-optimistic in the past two months.• The panel had also been over-optimistic on employment which fell by 3 percent compared to the 2 percent forecast.• Many of the orders were based on over-optimistic plans for expansion rather than the replacement of existing aircraft. 