Undemonstrable is valid Scrabble Word

Is undemonstrable a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List NO
Collins Scrabble Words YES
Is undemonstrable valid Words with Friends?
Words with Friends NO

Definitions for UNDEMONSTRABLE in dictionary:

How to use UNDEMONSTRABLE in a sentence

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