pre·sump·tu·ous (prĭ-zŭmp'chōō-əs) adj. Going beyond what is right or proper; excessively forward.
[Middle English, from Old French presumptueux, from Late Latin praesūmptuōsus, variant of praesūmptiōsus, from praesūmptiō, presumption; see presumption.] pre·sump'tu·ous·ly adv., pre·sump'tu·ous·ness n.