pre·sump·tu·ous 
(prĭ-zŭmpch-əs)
(prĭ-zŭmpch-əs)adj.
Going beyond what is right or proper; excessively forward: felt it was presumptuous of him to assume they had become friends.
[Middle English, from Old French presumptueux, from Late Latin praesūmptuōsus, variant of praesūmptiōsus, from praesūmptiō, presumption; see PRESUMPTION.]
pre·sumptu·ous·ly adv.
pre·sumptu·ous·ness n.