unctuous
1. Characterized by affected, exaggerated, or insincere earnestness: “the unctuous, complacent court composer who is consumed with envy and self-loathing” Rhoda Koenig.
2. Having the quality or characteristics of oil or ointment; slippery.
3. Containing or composed of oil or fat.
4. Abundant in organic materials; soft and rich: unctuous soil.
