Webster's English Dictionary

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unctuous

un.ctu.ous \'*n(k)-ch*(-w*)s, '*n(k)sh-w*s\ aj [ME, fr. MF or ML; MF 
   unctueux, fr. ML unctuosus, irreg. fr. L u]nctum ointment, fr. neut. of 
   unctus, pp. 1a: FATTY, OILY  1b: smooth and greasy in texture or appearance 
    2a: rich in organic matter and easily workable {~ soil}  2b: PLASTIC {fine 
   ~ clay}  3: full of unction; esp : revealing or marked by a smug, ingratiat 
   ing, and false earnestness or spirituality - unc.tu.ous.ly av