Yes, dubious is a Scrabble word!
...and is worth 10 points in Scrabble, and 13 points in Words with Friends
dubious
Adjective
1. Fraught with uncertainty or doubt
2. Open to doubt or suspicion
3. Not convinced
What Scrabble words can I make with the letters in dubious?
4 Letter Words
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3 Letter Words
2 Letter Words