unctuous | unc·tu·ous |ˈəNG(k)(t)SH(o͞o)əs
(adjective)
- (of a person) excessively or ingratiatingly flattering; oily: he seemed anxious to please but not in an unctuous way.
- (chiefly of minerals) having a greasy or soapy feel.
<ORIGIN>
late Middle English (in the sense ‘greasy’): from medieval Latin unctuosus, from Latin unctus ‘anointing’, from unguere ‘anoint’.