Presumptuous
Middle English: from Old French presumptueux, from late Latin praesumptuosus, variant of praesumptiosus ‘full of boldness’, from praesumptio (see presumption).
wiktionary
From Middle English presumptuous, borrowed from Old French presumptieus, presumpcieus, presumptuos, from Latin praesumptuosus.
etymonline
presumptuous (adj.)
mid-14c., "arrogant, overweening, impertinent, going beyond the limits of propriety or good sense in thought or conduct," from Old French presuntuex, presontuos, presumptueuse (12c.; Modern French présomptueux) and directly from Late Latin praesumptuosus "full of boldness," a variant of praesumptiosus, from past participle stem of Latin praesumere "anticipate," in Late Latin, "assume" (see presume). Related: Presumptuously; presumptuousness.
