presumptuous[prē zump′c̸ho̵̅o̅ əs, pri-; -c̸ho̵o wəs]
An example of presumptuous is assuming that you will win the city wide spelling bee just because you scored 100% on your last spelling quiz.
Origin of presumptuousMiddle English ; from Old French presunteux ; from Late Latin praesumptuosus ; from Classical Latin praesumptus: see presumption
Origin of presumptuousMiddle English, from Old French presumptueux, from Late Latin praesūmptuōsus, variant of praesūmptiōsus, from praesūmptiō, presumption; see presumption.
(comparative more presumptuous, superlative most presumptuous)