Middle English word presumptuous comes from Latin -osus, Latin praesumptio (Anticipation. Obstinacy, stubbornness. Presumption.)

Detailed word origin of presumptuous

Dictionary entry	Language	Definition
-osus	Latin (lat)	-ose, -ous; full of, prone to. Used to form adjectives from nouns.
praesumptio	Latin (lat)	Anticipation. Obstinacy, stubbornness. Presumption.
praesumptuosus	Latin (lat)
presumptuos	Old French (fro)
presumptuous	Middle English (enm)

Words with the same origin as presumptuous