Undemandingness is valid Scrabble Word

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

Definitions for UNDEMANDINGNESS in dictionary:

Similar words containing DEMANDINGNES without suffix s and without prefix un

demandingness18 demandingnesses20
Find what other words can be done using letters: "undemandingness"
https://scrabble-word.com/finder/undemandingness
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