unctuous [uhngk-choo-uh s]
1. characterized by excessive piousness or moralistic fervor, especially in an affected manner; excessively smooth, suave, or smug.
2. of the nature of or characteristic of an unguent or ointment; oily; greasy.
3. having an oily or soapy feel, as certain minerals.
Origin: 1350-1400; Middle English < Medieval Latin ūnctuōsus, equivalent to Latin ūnctu (s) act of anointing ( ung (uere) to smear, anoint + -tus suffix of v. action) + -ōsus -ous
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