greas·y / ˈgrēsē; -zē/ • adj. (greas·i·er, greas·i·est) covered with an oily substance: he wiped his greasy fingers. ∎  producing more body oils than average: greasy skin. ∎  containing or cooked with too much oil or fat: greasy food. ∎  of or like grease: their moisturizers don't feel greasy. ∎  slippery: the floor was greasy. ∎ fig. (of a person or their manner) effusively polite in a way that is felt to be insincere and repulsive: the greasy little man from the newspaper.DERIVATIVES: greas·i·ly / -səlē; -zəlē/ adv.greas·i·ness n.

greasy Of mineral lustre, having the appearance of an oily coating, due to the scattering of light by a surface that is rough at the microscopic scale.