Unattested is valid Scrabble Word

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

Definitions for UNATTESTED in dictionary:

How to use UNATTESTED in a sentence

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