unctuous

Concise Oxford English Dictionary © 2008 Oxford University Press:
unctuous /ˈʌŋ(k)tjʊəs/

▶adjective

• 1 excessively flattering or ingratiating.

• 2 having a greasy or soapy feel.

– derivatives
unctuously adverb,
unctuousness noun.

– origin ME (in the sense ‘greasy’): from med. L. unctuosus, from L. unctus ‘anointing’, from unguere ‘anoint’.