rotund UK /ɹəʊ̯ˈtʌnd/US /ɹoʊ̯ˈtʌnd/ adjective3 •Having a round, spherical or curved shape; circular; orbicular.Convex preferences may have indifference curves that exhibit “flat spots,” while strictly convex preferences have indifference curves that are strictly rotund. — 1992 •Having a round body shape; portly or pudgy; obese. •Full and rich; orotund; sonorous; full-toned. formsrotunder · rotundest