Learn how to say Unctuously correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word unctuous:
1excessively flattering or ingratiating; oily:
he seemed anxious to please but not in an unctuous way
2(chiefly of minerals) having a greasy or soapy feel.
late Middle English (in the sense ‘greasy’): from medieval Latin unctuosus, from Latin unctus ‘anointing’, from unguere ‘anoint’