Etymology
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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.

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Definitions of presumptuous

presumptuous (adj.)
excessively forward;
the duchess would not put up with presumptuous servants
Synonyms: assumptive / assuming
From wordnet.princeton.edu