unctuous

From Wiktionary

Pronunciation[change]

Adjective[change]

Positive
unctuous

Comparative
more unctuous

Superlative
most unctuous

  1. (of a liquid or substance) If a substance is unctuous, it is oily or greasy.
  2. (by extension) If a person is unctuous, they are polite but would want something in return.