covered with grease

slippery, oily

(of) the white substance forming the tusk of elephants

fair

of, like, oil; covered or soaked with oil

fatty, greasy

(of surface) level or polished, like glass; calm and free from uncomfortable movement; (of a liquid mixture) free from lumps

level, unwrinkled; flowing

not solid or firm; easy to bend, dent etc; pleasant and smooth to touch; (of light, colour) restful to the eyes

cushioned, squishy