Yes, unctuous is a Scrabble word!
...and is worth 10 points in Scrabble, and 15 points in Words with Friends
unctuous
Adjective
1. Unpleasantly and excessively suave or ingratiating in manner or speech
What Scrabble words can I make with the letters in unctuous?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words