[unc.tu.ous] adj [ME, fr. MF or ML; MF unctueux, fr. ML unctuosus, fr. L unctus act of anointing, fr. unguere to anoint] (14c) 1 a: fatty, oily b: smooth and greasy in texture or appearance
2: plastic "fine ~ clay"
3: full of unction; esp: revealing or marked by a smug, ingratiating, and false earnestness or spirituality -- unc.tu.ous.ly adv -- unc.tu.ous.ness n