Unsupportable is valid Scrabble Word

Is unsupportable a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is unsupportable valid Words with Friends?
Words with Friends YES

Definitions for UNSUPPORTABLE in dictionary:

How to use UNSUPPORTABLE in a sentence

Find what other words can be done using letters: "unsupportable"
https://scrabble-word.com/finder/unsupportable
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