Middle English word importen comes from Latin portare, Latin ingratus (Thankless. Ungrateful. Unpleasant, disagreeable.)

Detailed word origin of importen

Dictionary entry	Language	Definition
portare	Latin (lat)
ingratus	Latin (lat)	Thankless. Ungrateful. Unpleasant, disagreeable.
importare	Latin (lat)
importer	Old French (fro)
importen	Middle English (enm)