OILY
greasy, oily
(adjective) smeared or soiled with grease or oil; “greasy coveralls”; “get rid of rubbish and oily rags”
greasy, oily, sebaceous, oleaginous
(adjective) containing an unusual amount of grease or oil; “greasy hamburgers”; “oily fried potatoes”; “oleaginous seeds”
oily
(adjective) coated or covered with oil; “oily puddles in the streets”
buttery, fulsome, oily, oleaginous, smarmy, soapy, unctuous
(adjective) unpleasantly and excessively suave or ingratiating in manner or speech; “buttery praise”; “gave him a fulsome introduction”; “an oily sycophantic press agent”; “oleaginous hypocrisy”; “smarmy self-importance”; “the unctuous Uriah Heep”; “soapy compliments”
Source: WordNet® 3.1
Etymology
Adjective
oily (comparative oilier, superlative oiliest)
Relating to or resembling oil.
Covered with or containing oil.
(figuratively) Excessively friendly or polite but insincere.
Noun
oily (plural oilies)
A marble with an oily lustre.
(in the plural, informal) Oilskins. (waterproof garment)
Source: Wiktionary
Oil"y, a. [Compar. Oilier; superl. Oiliest.]
1. Consisting of oil; containing oil; having the nature or qualities
of oil; unctuous; oleaginous; as, oily matter or substance. Bacon.
2. Covered with oil; greasy; hence, resembling oil; as, an oily
appearance.
3. Smoothly subservient; supple; compliant; plausible; insinuating.
"This oily rascal." Shak.
His oily compliance in all alterations. Fuller.
Oily grain (Bot.), the sesame.
– Oily palm, the oil palm.
Source: Webster’s Unabridged Dictionary 1913 Edition