oily /ˈɔɪli/adjective 3noun 2forms 3phrases 1 adjective3 •Covered with or containing oil.His clothes were apt to look oily and smell of eating-houses. — 1853 •(figurative) Excessively friendly or polite but insincere.[…] for I want that glib and oyly Art, To speake and purpose not, since what I well entend Ile do’t before I speake, […] — 1603 •Resembling oil.There were no breakers and no waves, for not a breath of wind was stirring. Only a slight oily swell rose and fell like a gentle breathing, and showed that the eternal sea was still moving and living. — 1895 noun2 •[in the plural] (informal) Oilskins. (waterproof garment) •A marble with an oily lustre.Lustered (also called lusters, rainbows, oilies, and pearls). — 1998 formsoilies · oilier · oiliest Phrases with oily smell of an oily ragA very small amount, or the absolute minimum (usually of money).