Yes, insane is a Scrabble word!
...and is worth 6 points in Scrabble, and 8 points in Words with Friends
insane
Adjective
1. Afflicted with or characteristic of mental derangement
2. Very foolish
What Scrabble words can I make with the letters in insane?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words