oily vs unctuous

oily and unctuous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
oily	No	Yes	No	No
unctuous	No	Yes	No	No

As adjectives, oily and unctuous are synonyms defined as:

oily and unctuous: unpleasantly and excessively suave or ingratiating in manner or speech

Other synonyms of oily include buttery, fulsome, oleaginous, smarmy, soapy.

oily (adjective)	unctuous (adjective)
coated or covered with oil	unpleasantly and excessively suave or ingratiating in manner or speech
smeared or soiled with grease or oil
containing an unusual amount of grease or oil
unpleasantly and excessively suave or ingratiating in manner or speech