The Oxford Thesaurus An A-Z Dictionary of Synonyms - oilyadj.

1) greasy, oleaginous, fat, fatty, adipose, pinguid, sebaceous, soapy, saponaceous, buttery, butyraceous, lardaceous; slippery, slimy, slithery, smooth, unctuous: The cars slid about as the tyres failed to grip the oily surface. 2) glib, smooth, unctuous, servile, obsequious, sycophantic, ingratiating, flattering, hypocritical; suave, urbane, sophisticated, Colloq smarmy: Sarah found Curtis's approach sickeningly oily.