unctuous vs oily

unctuous and oily both are adjectives.

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

As adjectives, unctuous and oily are synonyms defined as:

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

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

unctuous (adjective)	oily (adjective)
unpleasantly and excessively suave or ingratiating in manner or speech	coated or covered with oil
	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