i-adjective
Describes food, skin, or surfaces that feel or taste unpleasantly oily. Similar to 脂っこい but often implies a lighter or more superficial greasiness.
See also: 脂っこい (あぶらっこい)
この料理は脂っぽくて、あまり好きじゃない。
This dish is greasy, so I don't like it very much.
脂っぽい肌には、さっぱりした化粧水が
For oily skin, a light toner is good.
脂っこい is stronger and often used for heavy, rich, or persistently greasy food; 脂っぽい can be milder or more about surface oiliness.
Formed from 脂 (あぶら, 'fat, grease') + the adjectival suffix っぽい ('-ish, tending to'). The suffix っぽい adds a sense of 'having a tendency toward' or 'somewhat'.